Up to a point:
women under heavy physical stress stop having periods and
become infertile. I first came across this in the RW in an account
by a British doctor who was attached to Tito's partisans in WW2,
all the women partisans he examined were in this state.
I've also heard of this happening to female athletes (in training
at the sort of level required to compete in the Olympics).
Whether the ordinary adventuring lifestyle would produce this effect I don't know.
Andrew
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