Cyrus Anticipates Sexless Over-40 Life: Matt Lauer Is Dying to Teach Miley Cyrus About Sex on the Today Show

Miley Cyrus just told Matt Lauer she'll probably stop being so sexual when she turns 40 ... because that's the age when people STOP having sex.

What do sex experts or sexologists know anyway?

Joy Behar interviewed a sex expert on her Current TV show and the chick busted out an orgasm right there on TV -- just by THINKING about it.