having you ever caught someone having sex or masturbating and been turned on it even though it was accidental. I have caught several of my roommates in college with various gf. But one time when I came come early after class. I walked in to see my roommate gf riding him like a horse. I only saw her for like three seconds before she covered up with a sheet. But those three seconds of her boobs bouncing up and down were enough to cause me to rub one out later. I was woken in the night to hear a different roommate beating off in the middle of the night which inspired me to do the same!