peq writes:
male nipples become erect during orgasm and in the lead up to it their sensitivity enables arousal so i would say that they are related to sexual activity.
But wether or not your nipples become erect during sex, doesn't hinder copulation so that is iffy and the point about stimulation could hold true for any part of the body. Rubbing someones feet could arouse them. Does that mean that feet are related to sex?
'Qui non intelligit, aut taceat, aut discat'
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The industrial revolution, flipped a bitch on evolution.-NOFX