No idea off hand. Try looking into the field of "sexology". The psychological study of sex.
BTW, one of the studies I read recently found that women were turned on by man-man, man-woman and woman-woman while men were only turned on by woman-man and woman-woman. Except for the gay guys, obviously. This led the researchers to conclude women have greater erotoplasticity. Which may be my favourite word ever.
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