I've never given birth, nor do I plan on doing so any time soon, if ever, so I cannot remark on that aspect of it.
As far as female orgasm though, firstly, the vagina engorges during stimulation which aids the penis in its intention of penetration, which means the gent can do deeper. Squirting or very wet orgasms also aid in penetration. It also just turns men on, which makes them want to fuck harder/deeper. This could all be an aid to nature's intention of procreation if it aids in sex.
I also have said for years; men get to rule the world, we get multiple orgasms. So maybe it is just nature's way of giving us at least one advantage over men.