Lasher

The Avatar meets Lasher the Unicorn in Dungeon Destard in Ultima VII.

Lasher is a typical Unicorn, and also has quite a dose of sarcasm when the Avatar asks obvious questions. Lasher tells the whole story of the Unicorns, but only if the Avatar is still a virgin. Because if he or she screws around (namely in the House of Baths), Lasher is so disgusted, he avoids the Avatar like the plague. That's because as all unicorns, he is a virgin detector.

Trivia

 * It really works! Screwing around will disgust Lasher. Seems to be a jab at censorship of sexual relationships.