what animial was the first to need sex before reproducing

Hmm, I don't know......the two things are intertwined, don't Ты think?? Ты know, would Ты have sex (and therefore reproduce eventually) if Ты didn't enjoy it and didn't want to?

But that raises other questions....how much of reproduction do Животные (not including humans) understand? Do they plan to reproduce, или does it just happen to them?

Once again, you've made me think through different perspectives!! :D