[maroonblazer]

>We might actually be far happier if we reserved man/woman sex just for reproduction.

I think it'll be just the opposite.

Genetic engineering will evolve to the point where it will be irresponsible to rely on the random variation of sexual intercourse to reproduce. Instead, methods like IVF and the like will be the only way to responsibly (ethically/morally) reproduce. Sex will then be solely for pleasure/connection.