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1.
When a man or woman has reached the maximum amount of time he or she can go without sexual intercourse.
"I really need to get laid. I'm way past my sexpiration date!"
by Quirky Girl January 03, 2010
 
2.
The time when an individual needs to stop having sex.
"Omg did u see that old lady in the club tonite?"
"O yea. She is way pass her sexpiration date"
by T.S.E. May 28, 2008