Reproduction isn't the sole goal in life or in love, we as a specie got over it a very long time ago, as far back as the greeks and probably before. There is romantic love, convenient love, sexual pleasure etc etc. Reproduction can be very important in life, but not for everyone.
We're too numerous anyway. The world population shouldn't be over 500M. Best way to get to this level would be to cull individuals with a positive rhesus, or to sterilize them.