I Never Say No!(1984)

Desiree Lane stars as Barbara, a wanton woman who turns a visit from a college chum into a weekend of wicked excess. The action centers on the amorous goings-on in and around Barbara's house after her old friend Delena shows up. These one-time sorority sweeties share a lot -- including a fervid desire to get down and dirty with Barbara's husband Edgar. Once Barbara finds out about her pal's carnal feelings, it sets in motion a wild weekend from which none of them may ever recover.