That's very true. However what I meant was that we need lust to jumpstart the human sexual response. Reproduction can of course happen without lust. However with lust reproduction is much more successful and plentiful.
And isn't there the stages of love or something? It goes lust, infatuation, love, and commitment. Something like that.
I think infatuation comes first. The only girl I ever loved I never spoke to for a while, but there was just something that attracted me that I couldn't label.
At that point I thought she was extremely attractive but already I didn't think "I'm gonna do her and let that be that" because the genuine infatuation had already set in. The only thing she lacked was the commitment it seems.
Anyway, I don't think there is a stage set up. Lust only comes first if your purpose is to lay them, from my experience.
-AC