Tongue 'n Cheek(1984)

Poor Betsy! She just doesn't seem to have the good oral skills to keep her hubby interested in sex. Maybe that's why he goes hog-wild when Betsy's gorgeous oriental friend, Ling, shows up and treats him to a healthy dose of the real thing. Betsy isn't mad when she discovers her best friend's face in her husband's lap - she just wants a few pointers. Ling's happy to help, and rounds up some willing subjects for their oral cram session. It isn't long before the ladies at the country club have heard of Ling's talents and seek her instruction as well. They turn a sweaty weight room into a full-on Orgy Fun Center! Everyone lives happily ever after.