Editors' Note: Guest blogger Dr. Helen Fisher is the founder and Chief Scientific Advisor to Chemistry.com. Dr. Fisher has been posting every Sunday evening for the past month, so I hope someone fixed her a plate.
I was fascinated with everyone¹s response to my blog on the evolution of homosexuality via kin selection. Thank you.
Here¹s another theory offered to explain the genetic diffusion of male homosexuality. It is based, foremost, on the work of Camperio Ciani and colleagues, published in 2004, who reported that females in the maternal line of male homosexuals are particularly fertile.
Hence the genes that contribute to male homosexuality are maintained at a low and stable frequency in the population because they promote female fecundity.
This process is known as "sexually antagonistic selection" because it jeopardizes the fecundity of one sex (men) while it gives a reproductive advantage to the other (women).
This type of selection is found in other creatures, including insects, birds and other mammals. But if the above theory is correct, male homosexuality would be the first trait selected by this method in people.
I have no comment on this theory. But long ago I came to believe that most of our dramatic human traits--as well as our remarkable variety--evolved for MANY reasons working in tandem with one another, not just one.
Anyway, that¹s the current buzz. Have a great July 4th. I¹ll be finishing my book on who we choose to love, due July 7th to the publisher. And as time goes on, I hope to share with you what I have discovered about gays and lesbians -- particularly how similar we ALL are in the ways we love.
"Come as you are" to Chemistry.com if you are looking for the one. And happy days, Helen.