It's the point in your life at which your age matches your number of sexual partners
Dude I just had an amazing weekend.

Why? What happened?

I hit my sexual equinox.

Bro, that's amazing, especially at 45.
by Barguments October 27, 2015
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Your sexual partners matches you age
YES just had my 69th birthday, I've finally met my sexual equinox
by sabs101 June 23, 2016
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