"Not soapboxing?" Yeah, right. Do you really, seriously, honestly believe that if the entire population of the planet inexplicably turned to homosexuality that humanity would simply give up on procreation and allow itself to die out? There are other options besides fucking to produce progeny. There's in vitro fertilization for one thing. And I'm sure if such a massive and important need appeared, science would step in to fill it.Theseus32 said:If all heterosexual people became gay, human life would be destroyed in a generation.
If all homosexual people became straight, no adverse effects would be had.
Not soapboxing here, just pointing it out.
Besides, society would eventually evolve and the role of heterosexual sex would change. It would probably become seen as a purely mechanical process, used just to breed. You'd probably have close friends agreeing to be the father/mother of the other's child. This might actually lead to a more communal approach to child rearing, which might actually be a good thing. There would probably even be matching services for this sort of thing, although I imagine it would probably be easier for lesbian couples to find a man willing to donate some sperm than it would for a male gay couple to find a woman willing to compromise her quality of life for 9 months.
I'm not saying it wouldn't be painful, but humanity isn't composed entirely of defeatist nihilistic pessimists. I'm sure we'd figure it out.