One day a brunette, a redhead and a blonde decide to go through their daughter's purses. 

So, the brunette goes through her daughter's purse and finds cigarettes. She says, "Oh my god, I'm so ashamed! My Daughter smokes." 

So, the redhead goes through her daughter's purse and finds an empty can of beer. She says, "Oh my god I'm so ashamed! My daughter drinks." 

So, finally, it's the blondes turn and she finds a used condom. She says, "Oh my god I'm so ashamed! My daughter has a penis."