Suppose there is some genetic component to deviant behavior (such as homosexuality). Such deviant behaviors tend to decrease reproductivity.
In a relatively closed society where people are discouraged from "coming out", deviants are more likely to toe the line, get married and breed more deviants.
However, in a more open society, deviants are likely to live an openly deviant lifestyle and tend to have fewer children.
So an open society which may at first tend to increase the visible population of deviants, may in time tend to decrease the actual population of deviants, as only the average Joe's and Josephine's are having babies.
The girls may be going wild now while the queer guys have their eyes out for the straight guys, but ultimately Ozzie and Harriet will be replacing their a**es with a new generation of College Republicans!