Introducing Kascha (1988)

Wanda and Manny are married but something is wrong. It's a common problem, Manny has withdrawn from his work and is sexually avoiding Wanda. However, with an appetite for sexual openness, Wanda contrives an erotic weekend in the mountains to dynamite Manny out of his cave. With the help of Wanda's interracial neighbors, their niece, and some incredibly steamy letters that Manny's sister Dana left at the cabin, the weekend becomes an orgy of released desires!