Dave's friends came up to him after work one day and asked him to go out for a few beers with them.

Dave replied, ''No, I can't. My wife gets really pissed if I come home late.''

Dave's friend said, ''When you get home, just go slide beneath the sheets, pull her panties down and give her oral sex. She won't say anything.''

So Dave goes out with his friends and has a great time. When he comes home hours later, he goes into his room and slides beneath the sheets. He pulls down her panties and begins to give her oral sex. She starts to moan and groan. After a while, Dave tells her that he has to go take a leak and for her to wait there.

When Dave gets to the bathroom he's stunned to see his wife inside. ''How did you get here?'' he asked.

''Shhhh,'' she replied, ''my mom is sleeping.''