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1.
When you make everyone believe you're sexually frustrated in your not-relationship.
Tara and Justin like talking about their not-sex with me because Justin's still jailbait.
by TatiBG October 17, 2012
 
2.
An act of intercourse that does not involve penetration, but which is held up to symbolise a healthy sex life by delusional homosexuals.
Bob and Tom had never actually had sex, but they regularly participated in Notsex, failing each time to convince friends and family that they were Notvirgins.
by Marianne Vermouth March 25, 2007