Risus uses a cliche system clearly influenced by Atlas Games[?]' Over the Edge[?] and is also similar in some ways to Unknown Armies[?], another "skill-list-less" system.
... the urethra is about 1-1.5 inches (25-38 mm) long and opens in the vulva between the clitoris and the vaginal opening. In the human male, the urethra is about 8 inches ...