A cougar is a man who has had an affair with another woman and it's often assumed that all women are like this. It's true that many women do consider affairs, so this isn't a surprising category to fall under. However, the fact remains that you're more likely to find a man with a female friend if they're trying to hunt down some nymphs. And it's not just women - even men can get involved in this lifestyle and you can find one in your local pub if you know where to look. But first things first - what exactly is a cougar?.