Well 6 is an average. For every 40 year-old thats never been married and has 20+ sexual partners, there's people who were married between 18-25 and probably only have 1-5 sexual partners.
6 does seem low, but we should remember that the previous generation tended to be married quite early and thus, likely had few or one sexual partner.\
Disclaimer: None of these are facts, they are numbers that I pulled out of my ass based on chaning social conventions.
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