How to ask somebody to have a 3 sum?

Question

How do you ask someone to have a 3 sum with out it being awkward?

Answer

Just some how bring the convo up about sex and stuff and then say something like "have you ever had a threesome or want one?" And then from there be like "yeah I wanna try one" then you should be able to continue

Answer

A little clue: 
Seinfeld, season 6 episode 11, "The Switch " ( http://m.imdb.com/title/tt0697796/plotsummary?ref_=m_tt_ov_pl)

How to ask somebody to have a 3 sum?

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