Don't forget that young sex for women was ordinary not that long ago in the western countries. Girls married at 13 and start having children. Certainly evolution-wise before cultural imperatives sexually mature females would start producing children as soon as they were mate-able.
A major part, imh(ysa)o, of the reason for apparent bareness in humans is so that women in particular look younger and thus more attractive. You see this today with a whole industry dedicated to encouraging apparent body bareness in women - shaved legs just for starters.
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