Is it normal to love one night stands?

I'm a 21 yr old guy, and I love going out, meeting a girl for the first time, taking her back to my place a drilling her. I've been with the same girl for 4 years and I really do love her. Nothing is better than a one night stand, I feel a sense of accomplishment. It's a challenge(sometimes) and I feel as though I won or scored when it works out the way I want. Know that these girls mean nothing to me other than gettin a piece.