This is a very poignant episode where Rose helps out impotent Ernie, and succeeds! We don't see the beast with two backs or whether Rose and Ernie used protection, but the poignant and sad bit was at the end when Ernie, after achieving the peak of success, dumps Rose to patch things up with is wife. Ernie is a new man pre-viagra thanks to Rose's efforts.
Review of The Impotence of Being Ernest
