Most women have experienced an almost O. Usually, it's because we're worried about taking too long or thinking about how to tell the guy his moves aren't doing it for us.

But the more surprising reason, especially if it's also happening in your solo sessions? You could be overstimulating your clit, says sex therapist Kat Van Kirk, Ph.D. We know, you keep hearing how most women need C-spot action to orgasm at all, but too much attention on the hot spot can be painful as you get close to finishing. Take a more indirect approach in that area (around the one o'clock position) to get over the brink.