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2.
The act of 'full sex' but stopping halfway through without either person having an orgasm.
A quickie behind the mall in your car would be considered "half sex"
by HalfSex man March 08, 2009
 
1.
The act of having your penis half way inserted into a vagina, while your partner forbids you of any movement whatsoever
Laura didn't want to lose her virginity so she decided to let Tim only go half way in her cave.

Tim had Half-Sex 12 times. so 6
by Enamaofthestate November 21, 2009
 
3.
When a guy stick his dick only part of the way into the girls vagina. The guy doesn't cum inside the girl either. But it is done in the same way as sex with hip thrusts and moaning from both parties.
Yo dude!!! I had half-sex last night on the couch in my Living room!!
by s2vash January 26, 2008