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Sex that is unusually rigorous and physically exhausting, similar to the P90X workouts.
"Looks like I can skip P90X tomorrow, that P90seX was a great workout."
by Cali139 September 21, 2009
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Intense, long sexual intercourse that results in sweating and soreness of the muscles just as P90X does.
Girl: "That was great...(breaths)"

Guy: "I know, this P90sex is a great workout, we should do it more often."
by Dyldo Joseph Baggins November 16, 2011
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