I used to be worried about what I looked like or that things I wanted to do would be perceived negatively by a partner, and was pretty inhibited with some partners.
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They think it contributes to blood flow and arousal of the clitoris and labia the tissue around the vagina which, in turn, contributes to arousal and orgasm.
Could it be that women and men simply tire of their partners?
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Buss is the author of The Evolution of Desire:
A new journal article suggests that evolutionary forces also push women to be more sexual, although in unexpected ways.
Without sufficient estrogen, it becomes dry and less acidic, increasing the risk of infection.