Sex mistakes even hot couples make: Cosmo talked booty with the author of a buzzed-about sex book. He shed light on the passion pitfalls that can sometimes snag even the most amorous duos.(Love And Lust)

* Even couples with a full-throttle sex life can hit a speed bump between the sheets. To keep you and your man moving and grooving, Cosmo talked to Ian Kerner, PhD, sex therapist and author of She Comes First. He clued us in on the mattress mistakes of carnally accomplished couples. Read on to find out if these erotic oopsies apply to you.

[Q] What's it like when a couple comes into your office for help?

[A] Everyone asks the same question on the first visit: Will they have to get naked? For the record, no one gets naked or has sex in my office, although many want to. You'd be surprised how many exhibitionists are out there.

[Q] Speaking of surprises, are you ever shocked by something someone says in sex therapy?

[A] I'm trained to be unbiased and sensitive to 'all sorts of situations.

[Q] Come on, you've never been just a little surprised?

[A] Well, all right. I'll confess. One time, I met with a guy who was only sexually satisfied when role-playing as a dog. He had a costume and liked to be walked in his yard. I assumed his girlfriend would be upset. Turned out, she liked him more as a dog than she did as a man, because he was more sexually attentive and willing to go down on her. I must admit that one threw me for a loop.