MIDUS study participants were asked to rate their sex lives from 0 to 10. Here are the means (sample size = 3,729):
Mean sex life rating:
Straight men 5.35
Homosexual men 5.09
Straight women 4.91*
Female bisexuals 4.44
Male bisexuals 4.12
*significantly lower than straight males
Straight men are the most satisfied; lesbians are the least. The gap between the highest and lowest groups is sixth-tenths of a standard deviation--a large difference. Women tend to give lower ratings, perhaps because they get less out of sex than men.
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