A college professor started to notice that one of his students, Dave, started gaining lots of female attention.

So, one day he asks Dave about his secret. Dave replies: "Well, before sex I simply whip out my willy and smack it against the bedside table, like a hammer. It numbs it up and makes me last longer".

Later that day, the professor gets home to his wife and finds her in the shower - a welcome opportunity for sex. So, he quickly undresses and starts banging his dick against the dresser, just before hearing his wife calling from the shower:

"Dave, is that you?".