Lust Chalet by John Dexter

From the back:

The resort lodge at Sugarhill Mountain housed every sordid activity known, every degradation... under the pretense of healthy relaxation... but healthy was not the word, certainly not for the depraved Wanda with her perverted longings for her own kind. With Cliff's shameful deeds with Janice. With Bixie, forced to purchase companionship from Larry, the virile young lover. Until he tumbled for Janice and decided to cast Bixie aside and give up his degrading career of love for sale.