You do realize that the vast majority of men aren't going to stop having sex no matter what the risks are. And even if most men stood in solidarity and went full monk mode it only takes a few scabs to maintain the population.

Hoes won't stop hoeing because that is their meal ticket.

The quality of people will decline but AI will eventually make that irrelevant. Even the tardiest tard can be made productive as long as he follows his AI assistant, possibly in conjunction with a shock collar.

The the future dystopia is already here, it just isn't evenly distributed.