> I keep seeing this and reports of decreased sexual drive and I always notice one environmental factor lacking from the studies, population. I go out to more rural areas and can't help but notice that people don't seem to have issues making babies in those areas, big families are quite common and most adults seem to have kids.

I have lived in a variety of rural areas for a number of decades and haven't seen this at all. I have 5 kids; I've seen very few families my size or larger - and nearly all of them were at church.