Word: baileys
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...study's authors, Nathan Bailey and Marlene Zuk of UC Riverside's biology department, report some exceptions, like the laysan albatross. Last year, researchers studying a Hawaiian colony of albatrosses found that nearly a third of all the couples involved two females who courted and then shared parenting responsibilities. (Albatrosses don't have U-Hauls, so no lesbian jokes, please.) Male chinstrap penguins also form long-term relationships, at least in captivity. And some male bighorn sheep will mount females only after the females adopt male-like behaviors. (Watch a gay marriage wedding video...
What explains all these variances? Here are some hypotheses I collected from Bailey and Zuk's paper as well as from some of their original sources...
...goodeid fish, for instance, sometimes have a black spot that resembles a spot that females get when pregnant. Dominant males then court them rather than fight with them. While the dominant guys are busy courting the subordinate, ladylike fish, the latter are able to "sneak copulations with females," as Bailey and Zuk write. I'm going to dub this the Hugh Grant Theory: it's not always the most masculine guy who gets the most girls...
...plus-one theory. Among flour beetles, males routinely force themselves on other males. According to Bailey and Zuk, there's some evidence that sperm deposited during this male beetle rape is sometimes transferred to a female later on, increasing the chances that she will have offspring...
...Bailey, Zuk and many others have pointed out, no one has offered an adequate evolutionary explanation for the relatively recent development of exclusive homosexuality among humans. In January, the journal Evolution and Human Behavior published a paper exploring the idea that certain alleles increase the likelihood of homosexuality by blocking the effect of androgens during fetal development. Having all those alleles hampers the masculinization of some parts of the brain that affect personality, making you gay, the theory goes. Brothers of gay men who have only some of the alleles would turn out straight but less aggressive than typical guys...