It's not a feminine thing to do so it's a sign of liberality.

Often they don't even admit it to their partners. It's the old 'I've got a headache' instead of, 'I don't feel like having sex,'

In relationships based on equality, couples tend to develop sexual habits that are more in keeping with both partners' interests. Male-centered cultures where sexual behavior is more oriented toward procreation tend to discount the importance of sexual pleasure for women.

When mama's not happy, nobody's happy.

Male-centered cultures where sexual behavior is more oriented toward procreation tend to discount the importance of sexual pleasure for women.

People in these age ranges are in fact engaged in a significant amount of sex. It should be a surprise to people in this age range but it will be to their children.