sex
razib | October 22, 2009If you have more than a marginal interest in evolutionary biology you will no doubt have stumbled upon the conundrum of sex & sexes. Matt Ridley's most prominent work, The Red Queen: Sex and the Evolution of Human Nature, covered both the theoretical framework and applied implications of the subject. Ridley leaned heavily upon William D. Hamilton's scientific work, which extended upon Leigh Van Valen's concept of the book's titular Red Queen. The complex interplay between pathogens & multicelluar organisms across the eons is a topic of such breadth and depth that a substantial…
zooillogix | October 19, 2009One of the world's few flightless parrots, the Kakapo is endemic to New Zealand and is notable for having parrot sex with this guy's head.
This is basically Benny's dream date. Thanks to reader Heather H. for sending along.
ejohnson | October 13, 2009Women's taste in men varies naturally with their menstrual cycle--during the more fertile period, they are more drawn to a square jawline, heavy brow, facial symmetry, and other signs of masculinity. But a new study by a team of British biologists shows that women taking birth control are not subject to the same cyclical preferences; because the hormones in the birth controll pill essentially trick the body into believing it is pregnant, women taking the pill consistently favor men with less masculine features, who in terms of evolutionary history tend to make more loyal and supportive long-…
razib | October 11, 2009Eric Michael Johnson has a post up, Does Taking Birth Control Alter Women's Sexual Choices?, where he surveys a new paper,Does the contraceptive pill alter mate choice in humans?. Eric notes:
The concern of the researchers is that a woman who gets involved with a guy while on the pill might find that she's no longer compatible with him once she stops later on in the relationship. Imagine waking up next to your boyfriend, or even your husband, one morning only to discover that you're just not that into him. While female comedians make such scenarios commonplace in their stand-up routines,…
razib | September 14, 2009Nearly 50 years ago W. D. Hamilton published two papers, The genetical evolution of social behaviour - I & The genetical evolution of social behaviour - II, which helped revolutionize our conception of how social and genetic process might work in concert. It opened up a field of research which was highlighted in Richard Dawkins' The Selfish Gene, and helped make inclusive fitness a general idea which allows us to view specific phenomena through a powerful theoretical lens. Hamilton's original work was broad in its implications and abstract in method, but concretely utilized various…
emjohnson | August 17, 2009Benjamin Franklin once quipped, "Where there's marriage without love there will be love without marriage." His affairs are well known in American history, however this founding father may have been stating a truth extending to evolutionary history as well.
Christopher Ryan (author of the forthcoming Sex at Dawn) offers some thoughts on the role of novelty in the sex lives of our favorite primate. He suggests that men are drawn to variety in sexual partners while women are drawn to variety in technique:
When researchers decided to look at this issue to develop a Sexual Boredom Scale, they…
clock | July 26, 2009A few years ago, I read Mary Roach's first book, Stiff: The Curious Lives of Human Cadavers and absolutely loved it! One of the best popular science books I have read in a long time - informative, eye-opening, thought-provoking and funny. Somehow I missed finding time to read her second (Spook: Science Tackles the Afterlife - I guess just not a topic I care much about), but when her third book came out, with such a provocative title as Bonk: The Curious Coupling of Science and Sex, I could not resist.
And I was not disappointed. It is informative, eye-opening, thought-provoking and funny.…
razib | July 25, 2009Love in 2-D:
Nisan didn't mean to fall in love with Nemutan. Their first encounter -- at a comic-book convention that Nisan's gaming friends dragged him to in Tokyo -- was serendipitous. Nisan was wandering aimlessly around the crowded exhibition hall when he suddenly found himself staring into Nemutan's bright blue eyes. In the beginning, they were just friends. Then, when Nisan got his driver's license a few months later, he invited Nemutan for a ride around town in his beat-up Toyota. They went to a beach, not far from the home he shares with his parents in a suburb of Tokyo. It was the…
grrlscientist | July 13, 2009tags: new rules, social commentary, humor, funny, Bill Maher, streaming video
In this video we learn, among other things, how to properly greet the first African-American POTUS and the identity of the REAL Islamic bomb [6:17]
edyong | June 29, 2009If the idea of a cold, motionless sexual partner isn't one of your turn-ons, then you're clearly not an echidna. The males of these spiny Australian animals will happily mate with females even if they're hibernating.
Gemma Morrow and Stewart Nicol from the University of Tasmania have spent the last decade studying the short-beaked echidnas of Tasmania. Over that time, they discovered many instances of males mating with torpid females in deep hibernation, or with females who roused themselves briefly only to re-enter their deep slumber. Over the last two years, the voyeuristic duo use a…
scicurious | June 25, 2009We know that a lot of organisms, from humans to bacteria to birds to bees, have lots of sex. But what has mystified scientists for years is WHY. I mean, it's fun and all (unless you're a poor beetle girl stuck with this), but what purpose does it serve? On the face of it, in fact, sex seems to be pretty BAD for about half of the population: the women. For example, there's a lizard out there than can reproduce both asexually and sexually. When it reproduces asexually, it producing nothing but girls, all of whom can reproduce both asexually and sexually. Net win. But when it reproduces…
clock | June 10, 2009From SCONC:
Science Cafe
July 14, 2009 | 7:00 P.M.
Uncovering the Mysteries of Human Fertility: On Sex, Fertile Days, and Why the Rabbit Dies
Speaker: Allen Wilcox, National Institute of Environmental Health Sciences
Everyone knows where babies come from, but few people appreciate the extraordinary and in some cases completely weird processes that have to work right in order for a new life to form.
Dr. Wilcox will discuss the key steps of human conception and early pregnancy including the window of days in which a woman can conceive, some of the factors that affect a couple's chances of…
edyong | June 5, 2009For humans, sex is a simple matter of chromosomes: two Xs and we become female; one X and a Y and we develop into males. But things aren't so straightforward for many lizards - many studies have found that the temperature of the nest also has a say, even overriding the influence of the chromosomes. But the full story of how the lizard got its sex is even more complicated. For at least one species, the size of its egg also plays a role, with larger eggs producing females, and smaller ones yielding males.
The discovery comes from Richard Shine's group at the University of Sydney. In earlier…
razib | May 25, 2009Dienekes points me to new research on MHC and mating:
The scientists studied MHC data from 90 married couples, and compared them with 152 randomly-generated control couples. They counted the number of MHC dissimilarities among those who were real couples, and compared them with those in the randomly-generated 'virtual couples'. "If MHC genes did not influence mate selection", says Professor Bicalho, "we would have expected to see similar results from both sets of couples. But we found that the real partners had significantly more MHC dissimilarities than we could have expected to find simply…
clock | May 18, 2009It is Sex Week on Deep Sea News.
It started with The Sand Dollar Love Shack: A Special Echinoblog to DSN and followed by 'Sleezy' sponge sexuality and more is yet to come for the rest of the week.
gregladen | May 12, 2009According to a study just coming out in the Journal of Sexual Medicine, "variations in emotional intelligence--the ability to identify and manage emotions of one's self and others--are associated with orgasmic frequency during intercourse and masturbation."
In short, the study found:
Emotional intelligence was not associated with ... age and years of education, nor did we find a significant association between emotional intelligence and potential risk factors for [female orgasmic disorder] FOD such as age, body mass index, physical or sexual abuse, or menopause. We found emotional…
clock | May 6, 2009I know PZ has recently posted a picture and a video of slugs mating. But these pictures were taken here in North Carolina, by blog reader Kris Barstow, who says:
The year was 1999 plus or minus a year, the site was a few miles from Asheboro, NC. I don't recall the season, but it was warm, and there is definitely a chill there in the cold seasons, so I assume spring or summer. It was about half an hour after sunrise; I was walking my dog. I would occasionally carry my camera "just because ..."
I saw these two acting strangely on the surface of the wooden shed. They actually attached themselves…
bioephemera | April 27, 2009
I'm off to visit the Supreme Court tomorrow, so I thought I'd share some law news for a change. In a landmark patent decision, Federal Circuit Judge Richard Posner has ruled that the sex toy shown above is "obvious."
You can read the explanation at Patently-O, but suffice it to say that the gap between the legal sense of the word "obvious" and its colloquial sense may be as wide as the gap for "theory" (as in, "but evolution is just a theory.") Honestly, I would not have known this was a sex toy if I hadn't been told. It looks like a bottle opener. Perhaps the dry design schematic leaches…
clock | April 23, 2009I loved Mary Roach's 'Stiff' when it first came out, so I was excited to see that Sheril started a book club reading the third book, Bonk, by the same author. My copy just arrived, so I will be participating as much as I can find the time.
Some of my SciBlings have already read and reviewed the book, e.g., SciCurious, or have the book and intend to read it, like Brian and Dr.Joan.
Sheril introduces the book here and begins the club, strangely with Chapter 5, here. Join in.
edyong | April 10, 2009We get a lot of information from watching other people. We read reviews, we follow links to recommended websites and we listen when our friends vouch for strangers. The opinions of strangers may even be a better guide to the things that make us happy than our own predictions. But humans aren't the only species to make decisions based on information gleaned from our peers - even animals as supposedly simple as flies can do the same.
Frederic Mery from LEGS (the Laboratory of Evolution, Genomes and Speciation) studied the fly Drosophila melanogaster and found that females have a tendency to…