"Peri-menopausal women, also, will go several months without a period and then have it show up." Plus, she says, it's possible and "not uncommon" for women to bleed while they're pregnant.

In “How to Think Like a Woman,” Regan Penaluna, a scholar who left the field, takes it to task for its historical misogyny and persistent sexism.

While many women orgasm with a partner for the first time, I am specifically addressing women who have never orgasmed with a partner and want to learn to have an orgasm.