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1.
putting a single nut in the asshole, vagima, ear, mouth,or toe to a woman or a man.
Jason had nut sex last night.
by Geoff Valiante February 21, 2008
 
2.
When a man inserts his testicles into the female genitalia
"Aww yeah, baby, open up that pussy, let's have some nutsex"
by Dan/Alex January 19, 2008