P90seX 

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."

P90seX by Cali139 September 22, 2009

P90sex 

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."

P90sex by Dyldo Joseph Baggins November 16, 2011