Well there is only a minority of women who becomes better with age.Once they turn 18 they right away lose their attractiveness, right?
In the USA - may be. In Russia pro-US activists also want to rise age of consent so it to be like in the US.Besides, it's illegal to have any sort of sexual intercourse with ppl under 18.
I do not know how it is in the US but here you cannot negotiate anything in marital agreement.Two words man - marital agreement.
You cannot negotiate that the kid will remain with you, you cannot negotiate your right to meet with him, you cannot negotiate alimony, you cannot negotiate abortion rights,
you cannot evict your former wife from your home if there are children, you cannot negotiate the usage of the state financial bonus for childbirth (only the woman can use it as she wishes).