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1.
The pleasant pain that follows an episode of hard sex.
Jim and Kathy did it so hard that they broke the bed. The next morning they both had a sexache.
by deSade June 06, 2012
 
2.
when you crave so deeply a sexual encounter with a romantic partner or love of your life.
I craved him so deeply, it was a physical ache..a sex ache.
by poet101 July 08, 2013