OMG...Are you nuts? First of all, there may be a numbing sensation, sure. But it would probably hide the burning sensation of whatever the blow is cut with- it could irritate your penis opening! Second of all, *HYPOTHETICALLY* I wouldn't let a man inside of MY vagina with coke on his penis- Oh, hell no! (Maybe if he was going to put it on his kok, then use a condom over it.) Third, why don't you just exercise some self control and masturbate a few hours before the intercourse- it will hold you off. (Or so I've heard.) Actually though to answer your question: If you put some cocaine on your penis it WILL numb the penis and supposedly make you stay hard, but I also heard that it's hard to climax because you can't feel the pleasure either- you don't feel anything! Also, if you actually snort the coke, it will make it hard to maintain an erection at all. Over all, introducing cocaine into the bedroom is just a bad idea.