There are some good ones out there, such as standing on your head after sex There are some other ones on this slideshow:
Headstands After Sex and Other Fertility Myths
What are some that you've heard?
Melissa Community Moderator
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I don't know if I would call it the strangest, but the one that drives me up the wall is the advice to "just relax". Like that is going to make my ovaries actually ovulate for a change!