I would suggest that if you enjoy taking in energy, that you do it from a source like a running river, the ground, the air, fire, a lightening storm, etc. This way no one gets hurt. Not only is taking energy from people bad for the people you take it from, but if they are unhealthy you'll feel ill from it. And if you try to take from someone who senses it, they may counter attack you. It is, after all, stealing their energy. Personally, when someone tried to take my energy, I channeled death energy around my aura (not inside my body). They never did it again to me. =)
So becareful, because if you cross someone like myself, I guarantee you won't get a "high" from it.