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Male-male penguin couples have become a fascination among zoo-goers.A pair in New York adopted an egg and became successful parents.(This is probably what happened in Tennessee if, in fact, there was even sex involved.) When exposed to a female in heat, groups of frustrated males sometimes engage in homosexual sex.Neither of these behaviors suggests a permanent preference for members of the same sex.Female albatross pairs seem to view males as little more than sperm donors, getting pregnant and then immediately returning to the female partner.It may even be possible to influence sexual preference in some species.
They mount each other in dominance displays, and that mounting can involve anal penetration.
Guppies raised in all-male tanks get used to courting one another and are less likely to mate with females later in life.
The same phenomenon has been observed in blue-tailed damselflies.
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I want to take a break from seeing her for a while, but now she is trying to make me feel guilty and is staying with my friends instead. Zebra finches administered synthetic hormones are more likely to form same-sex couples.