Word: sex
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...this-thing-works theory. Younger animals (particularly males, and including humans) sometimes engage in same-sex sexual behavior as practice, which may improve their reproductive success when they are ready for a heterosexual relationship later. Fruit flies who experiment with other members of the same sex as youngsters may have more baby fruit flies later on than those who don't experiment...
What all these theories have in common is that same-sex sexual activity is either an accident or a quirky genetic method of helping males impregnate females. Which raises the evolutionary question of why men and women who are exclusive gay and lesbian exist. One answer is that exclusive gays and lesbians are a relatively new creation: the concept of exclusive homosexuality barely existed before modernity; even a century ago, most same-sex-attracted men and women got married and had kids. (Read "Do Monkeys Pay for Sex...
...pictures of same-sex overtures across species...
...implicated by genetic testing, Ridgway pleaded guilty and was sentenced to 48 consecutive life sentences. Law-enforcement agencies around the world are assembling DNA databases, which have yielded matches that investigators may otherwise have missed. The FBI now has DNA records on more than 5 million convicted offenders, and sex offenders in all 50 states are required to submit DNA samples to law enforcement. (See the top 10 unsolved crimes.) In the early days of DNA testing, juries confronted with the novel technology sometimes hesitated to convict based on genetic evidence - witness the O.J. Simpson trial in 1995, when...
...sanctity" of marriage in the service of crusading against allowing gays to partake in it, and the membership of in the marital-fidelity-promoting male evangelical group the Promise Keepers, and the strident demands of for the resignations of Larry Craig and Bill Clinton in connection with their sex scandals - for a nine-month affair had by with a campaign staffer married to a friend...