Marilyn Chambers was a porn star before there were porn stars, having made her debut in 1972's Behind the Green Door. So it's only proper that as an "elder stateswoman" of the adult industry she should have her own line of instructional videos.

This volume has Marilyn showing a wide variety of dildos, vibes, lubes and oils as she talks one of the girls through the best ways to find a woman's clit and to exercise those vaginal muscles. The remainder of the title is devoted to showing three actresses applying Marilyn's techniques and exercises, and using the various devices and liquids previously depicted.

But as much as we enjoy watching a woman self-stimulate, none of the gals generates a lot of heat. Each girl does manage to bring herself to orgasm and combined with the genuinely useful info from Marilyn we feel justified in giving it a "marginal thumbs up."

Retailing: Well-stocked stores should have some instructional fare, and this will easily fill that bill.