A woman in stockings raising her skirt and urinating into the mouth of an ejaculating man. Urolagnia (also urophilia, undinism) is when people gain sexual pleasure from urine and/or urination. The term has origins in the Greek Language (from ouron, urine, and lagneia, lust).

Urolagnia is an inclination to derive sexual satisfaction from the vision or idea of urination. It is a paraphilia. During the activity, urine may be consumed or the person may bathe in it. Other variations include arousal from wetting or seeing someone else urinate in their pants or underclothes, or wetting the bed.