I'd say for this sex chat - that sex means intercourse.Define sex. Does it mean intercourse or are other variations counted as well? My official answer has always been 8. Based on some comments here, I would fear to say the unofficial one.
But having said that - I have 2 roommates - both female - and we all make each other orgasm a few times a day - but NEVER have "intercourse" - so if we take an example like that - I too would be afraid to say the real number!