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1.
A stalemate between you and your significant other when you both want to have sex, but neither wants to do all the work.
My husband and I wanted to have sex last night, but we were both too tired. It was a serious Sexican Standoff.
by Amarillo Bird August 24, 2013
 
2.
When two people are withholding sex from each other for different reasons.
Person 1: "I didn't want him to tease me, so he wouldn't let me tease him."
Person 2: "Oh, so you were in a Sexican standoff?"
by mygoodiessss November 29, 2011