That is exactly the point, you seem to be able to justify our sexuality in terms that are in fact acceptable to society, hence all those different positive points, but they all are genetic imperatives that supplement the principle one, reproduction.
Put another way, love is the excuse your brain and hormones give you to reproduce. This is science at its most basic level. All our drives, thoughts and ideas revolving around sexuality are justifications for the basic imperative of reproduction.
We have divorced sex from reproduction artificially, but our bodies continue to function in the same way they always did.
Television and Internet forum posting has nothing to do with reproduction either, we should find the genes that send us down thus useless pastime and change them so we can better focus our energies on our children. Don't you see how silly it is.