And last time i checked people didn't do sex just for reproduction.
Correct. Human sex is remarkably ineffecient. So inefficient that reproduction can hardly be the main purpose of it. Even in cultures where pre-marital sex is absolutely out of the question, newly wed couples, of whom you can safely assume to have lots of sex in their first months of marriage, only about 1/3 of the couples actually get pregnant in these first months.
And as overpopulated as our world is now, I say reproductive sex isn't exactly a priority.
There's no overpopulation. Almost every statistic in the world proves the opposite. The most glaring being the following:
1/3 of the world is hungry
1/3 of the world is overweight.
The food is just in the wrong place.