The Strongest Viagra
So this older guy goes to the doctor asking for a prescription for 'Viagra'. The guy asks for a large dose of the *strongest* variety. The doctor asks why he needs so much. The guy says that two young nymphomaniacs are spending a week at his place. The doctor fills the prescription.

Later that week, the same guy goes back to the doctor asking for pain killers. The doctor asks 'why, is your dick in that much pain?', 'no', says the guy, 'it's for my wrists - the girls never showed up!'