If being gay is in the genes, like some other mental illness, is it unethical to make a gay pill to suppress the urge and make a nonprocreating human into a procreator.

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There's a lot of subtext in your question--you seem to be suggesting that if there are genes that influence whether one is homosexual or heterosexual, that indicates that being gay is a mental illness. That would be a very strange argument, since the fact that there are genes that influence traits or behaviors says nothing about whether that trait or behavior is good or bad in either the biological or ethical sense.

Perhaps you are thinking that because homosexuals do not have the desire to mate with the opposite sex, any genes that may underlie homosexuality are "maladaptive" in the way some mental illnesses are caused by maladaptive genes. But that is also a mistake, since (a) in humans' past evolutionary environments homosexuals may have reproduced (they wouldn't be the only humans who have had sex for procreation without being particularly attracted to their mates!), (b) there are interesting data suggesting that homosexuality in some animal species (perhaps including humans and their ancestors) is a biological adaptation (the short story is that homosexuality might be associated with increased altruism towards relatives and hence cause a net increase in related genes), and (c) any genes related to homosexuality may have been selected for because they "code for" other traits that are adaptive, while homosexual feelings or behaviors are simply byproducts of those traits (this would not mean homosexuality was "maladaptive" any more than our ability to do calculus or dance the tango is maladaptive--the useful desires and abilities to do calculus and to dance are byproducts of other traits that were selected for).

So, all of this is to say that even IF there are genes that influence humans' sexual preferences (and that has not been demonstrated yet), then that does not suggest that homosexuality is biologically "unfit" or maladaptive in any way (as mental illnesses generally are). But whether there are such genes also says nothing about whether a pill could be created to suppress homosexual desires (or to suppress sexual desires in general, which may be useful for some politicians to have!). Such pills seem feasible as long as these desires and behaviors are influenced by the sorts of things pills influence (e.g., our brain states), as they surely are.

This brings us to another problematic implication of your question--that the lack of a desire to procreate (or lack of procreating behavior) is a bad thing that should be suppressed. In our current environment, it might be a good thing for humans to procreate less (and for some politicians to procreate less "diversely"). Of course, if no (or too few) humans wanted to have sex with the opposite sex, well, we might need to do something, but in that case I doubt it would take a pill to get people to either have heterosexual sex or to use the artificial means we have to reproduce.

I should add that if it turns out that homosexuality is shown to be more a matter of genes than upbringing or choice, then it seems like that would help people arrive at the ethical conclusion that there is no reason to discriminate against homosexuals (as we have, too slowly, arrived at that conclusion about race, gender, and indeed, some mental disorders). But the worry is that, using the weak arguments I discussed above, people may instead think that homosexuality is unnatural or maladaptive or an illness that needs to be cured (or worse, eliminated). So, if you did not mean anything like this by your question, I apologize that my answer sounds a little grumpy!

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