Mormon knees
Premature ejaculation, especially ejaculation prior to any direct genital stimulation. From a story about 2 Mormon adults "making-out." The couple was following church guidelines-- no tongue kissing, no laying down, no touching private areas of the body-- basically just lots of tongue-less kissing. When the woman, who was wearing a long skirt, shifted in her seat and inadvertently let her knees show for a brief second, the man ejaculated into his underwear.
I have to relieve this build-up or I might just have get a case of the Mormon knees on my date tonight.