I think this is a very uninformed opinion. If what you said was true, there is no logical reason for why humans would have sex while they are already pregnant.

I think this is a very uninformed opinion. If what you said was true, there is no logical reason for why humans would have sex while they are already pregnant. I won't even point out all the reasons your argument doesn't make sense, because it's clear you haven't thought about what it would mean if what you said was true. It just doesn't match up to real human behavior.