Women Are Cougars, What Are Men?

I'm sure during recent years we've all become familiar with the term used to describe women who date younger men, cougar. I'malso sure we've all become familiar with a few examples, too, there's Demi Moore, Madonna, and Mariah Carey to name a few. It seems that ppl moreso look down upon women who date younger men while once again men are praised for doing the same thing. I'm not really understanding why though. Why is ok for men, but not for women? So my question is what do you call men who date younger women? Is there even a word to describe a man who dates younger women like there is for women who date younger men?