Sometimes my wife has a perverse desire to humiliate herself in front of a group of strangers. She invites them to stand over her and jerk off, letting their semen fall onto her body, which is wearing merely her knickers. She waits patiently while they cover her, as many as a dozen men if that many can be assembled. She says she feels degraded, humiliated, and sexually energised. After they have finished, she continues to kneel until they have all gone. Then she fetches a ziplock plastic bag, removes her soiled knickers and puts them in the bag. For some weeks afterwards, the bag preserves the acrid odour of the men’s sperm, which she inhales when she is going to masturbate. She may even lick the knickers and rub them against her cunt. Sometimes after this she will ask me to whip her as punishment for her depravity,, she says.

In all other ways, she is sexually normal; even somewhat inhibited, I would say.