Researchers at Northwestern confirm that Male Bisexuals exist ( NYT )
posted by The Whelk on Aug 23, 2011 - 124 comments

Interesting effect on the lack of the neurotransmitter serotonin in male mice.
posted by Brandon Blatcher on Mar 23, 2011 - 37 comments

The "Darwinian paradox" of homosexuality presents the conundrum of how a potential genetic basis for homosexual behavior could provide a survival benefit to offpsring and extend through generations, when sexual reproduction would seem to place strong selection pressure against such a "gene". Recently developed mathematical models (PDF) from researchers Sergey Gavrilets and William Rice not only show how a "gay gene" might proliferate within a population, but also provides testable hypotheses, including predictions of "widespread bisexuality" (subscription req'd).
posted by Blazecock Pileon on Jan 14, 2007 - 68 comments

Sexual ornaments grow out of all proportion It seems that men will be men throughout the animal kindom, not just our little lonely corner of of it. Most body parts grow proportionally with the rest of the body as individuals of a species become larger, although scientists have long known that visual cues of reproductive prowess are a special case. But is this the case with everyone?
posted by pezdacanuck on May 23, 2006 - 41 comments

Different scent attraction for men, women, and homosexuals Interesting report about homosexual men responding differently to pheromones as heterosexual men but very similar to women. (NYT)
posted by dov3 on May 10, 2005 - 53 comments

New research takes steps towards finding the "gay genes." A study conducted on gay brothers in more than 100 families found several genetic regions of similarity with linkage to sexual orientation. This is kind of dense (scroll to the bottom of the page for the FAQ), but that's because it hasn't been written up in the press so there are only journal doc's and scientific summaries available.
This is the press release, which is clearer (Microsoft Word).
This is the article on the study, as published in the journal Human Genetics (PDF).
posted by joe_murphy on Jan 20, 2005 - 107 comments

Micro-penis sufferers, rejoice!
posted by digaman on Dec 7, 2004 - 50 comments

neurodiversity
An amazingly wide and varied site which began as a collection of articles about Autism but which has expanded to survey such varied topics as left-handedness, gender and sexual orientation, hysteria, and a fascinating collection of articles on "Neurotypical Issues." Hours and hours of material from a wide variety of viewpoints.
posted by anastasiav on Sep 13, 2004 - 12 comments

Tumor-induced Pedophilia - the BBC reports on an american man who, at the age of 40, developed completely uncontrollable and ammoral sexual impulses after developing a tumor in the right lobe of the orbifrontal cortex. After the tumor was removed, he returned to normal. More inside...
posted by Irontom on Oct 21, 2002 - 28 comments