> The age of consent being this low is to avoid prosecuting 15-20 yo having sex with each other. Not for gross old men to coerce minors into having sex with them.

I don't buy this argument. That is addressed by age gap laws which some countries have or in the U.S. where there age of consent is different if one of the parties is over 18 and 21.

You can't honestly be claiming that these type of relationships don't occur in these countries. The fact is that in homogeneous populations there seems to be way more tolerance for these kind of age gaps.