Guys, for centuries philosophers have been musing about the difference about "love" and "lust" and the relationship between the two. I doubt if we will solve the debate here!
I do agree totally with Dodger that those who scorn "human mating" for the sheer pleasure of orgasm are missing out on a totally different and much more interesting experience. Why not order a blow-up sex doll instead? Or jack-off in the comfort of your bed without all the muss and fuss and expense?
None of us will ever quite solve this mystery but I can observe that most males seem mature over the years from wanting to fuck anything that breathes to becoming slightly more introspective about the sex act.