“7th Secret” (* out of four) was a lifeless melodrama about an unhappy young wife (Kristin Minter) who decides to seek sexual fulfillment elsewhere and begins exploring the sexual underworld and leading a double life. Probably sounds juicy and sexy but is almost worthless on every level. Natasha Henstridge, Stacey Dash, and Joan Jett are all wasted in meaningless supporting roles; why they signed on for this timewaster might be the film’s real “secret.” Some of the dialogue and acting are laughably awful.