Nina Hartley is a world-class spokesperson when it comes to sex, and she's particularly effective in communicating to couples. Nina Hartley's Guide to Erotic Massage, in fact, is geared towards couples who are already in established, long-term relationships and who need some direction to rekindle lost intimacy or simply are looking for a new spark.

Randy Spears is on the receiving end of Nina's tutorial – which ends up turning into a full-on hardcore scene. Alec Knight later does the same to Marie Luv.

Nina's co-spokesperson, however, ought to be more comfortable speaking in front of the camera.

Retailing: Nina Hartley fans will enjoy this as much as couples looking for a good bit of sex ed.