Nun fetish
From wipipedia.org
A nun fetish is a sexual fetish in which either a man or a woman enjoys dressing as nun, or someone derives sexual pleasure from viewing women (or possibly men) dressed in this manner. Much of the pleasure may derive from the fact that nuns are under a vow of chastity, and people may enjoy the thought of having sexual intercourse with a virgin, or contrast the real behaviour of the person with apparent sexual abstinence.
The nun's outfit may be realistic, or made sexier by for example PVC clothing, a very short skirt, stockings, fishnet tights or high heels.
