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2.
Having sex more than 3 times in one night. Each time lasting more than an hour.
Last night me and my boyfriend had marathon sex, we didn't go to sleep until 6 this morning!
by Hannahboo32 October 14, 2007
55 30
 
1.
Sex that continues for hours per session, punctuated by winded intermissions wherein the parties involved sweatily seek to restore the normal oxygen-carbon dioxide mix in their blood; Sex that burns as many calories as a marathon.
Our marathon sex session came to an end when both of us were simply too tired to continue.
by howe March 24, 2005
108 20