Ever notice how the calling for “pleasure girls” always crop up with all manner of fascists? Hitler, Mao, Norks and Muslims practice this form of institutional prostitution..all under the guise of the “cause”.
I think it’s pretty standard practice with all manner of cults - it stands to reason that if you can bestow (or withhold) sexual gifts on (or from) cult members you can have a tighter degree of control over them.