So let's just enable this behavior even more, on an even larger scale? What you described happens, but it's not comparable to this. A single man's sperm can now be used to impregnate several women with a much lower barrier (as we can see from the article posted here). This issue has also been reported elsewhere, it's clearly becoming more wide spread, and we don't know what we're getting ourselves into, all because of greed and selfishness.