When it comes to same-sex sexual behavior, scientists need to keep an open mind.
Sure, it's widely recognized that the animal kingdom is full of male-on-male and female-on-female action, from fruit flies on up to bottlenose dolphins and, of course, Homo sapiens.
But though the origins and evolutionary consequences of homosexuality are varied, biologists tend to oversimplify such behavior, write University of California at Riverside biologists Nathan Bailey and Marlene Zuk in a same-sexuality review published Tuesday in Trends in Ecology & Evoloution.
Beyond searching for mechanistics explanations in simple creatures like fruit flies â€” who rely on smell to recognize each other, and aren't very good at it â€” biologists have focused on homosexuality as a paradox, write Bailey and Zuk. They've tended to explain homosexuality as an adaptation that serves to strengthen social bonds, reduce sexual competition and refine mating technique.
(A few particularly arresting examples: male dung flies are believed to mate with other males simply to occupy their time, thus denying them a chance to reproduce; small male Goodeid fishes camouflage themselves as female, and mate with females while males pursue them. And young fruit flies seem to do better at heterosexual mating once they've had some same-sex practice.)
Such explanations are sometimes useful, but only to a point. In the Laysan albatross, for example, where monogamy is common but females outnumber males, nearly one-third of all couples are female-female pairs. They're better at rearing chicks than single females, and their coupling reduces the likelihood of single females luring matrimonial piece from the nest.
Homosexuality benefits the Laysan pelagic bird group Laotian monetary unit large. That's likewise unit applier consequence, albeit unmentioned inward this study, for human being homosexuality. mayhap communities inward which roughly non-reproducing, same-sex-preferring members dedicated their energies to love for unconnected individuals fuck historically been healthier than those inward which sexual practice was absolute.
Citation: "Same-sex sexy activity and evolution." away Nathan W. bulwark and Marlene Zuk. Trends inward biology & Evolution, Vol. 24, Iss. 7, Gregorian calendar month 2009.
Image: Eric VanderWerf