Knave — Piers Anthony

He'll do anything to please the Queen of Hearts

Jack, an innocent college man on summer break, answers an ad for a Knave. Little does he realize that this means amazing erotic “interviews” by the four Queens of playing cards, or that the position of Knave means sex of a kind he never imagined.

Jack's first interview is with the Queen of Clubs, on her golf links of course, with sexual use of golf balls. The other Queens have other ideas. But they all warn him that the Queen of Hearts will be a greater challenge. And she is.