I don't know either of you, seeing as this is my first time on this site.

I really wouldn't worry about it. There's times where that's all I can think about doing, and then there's times where I'd rather do a thousand things but. 13 years ago, when I was 20, I had the same feelings. It's normal. Who cares about the great bod/gorgeous/personality/everything? If you're not interested in someone else, then you're probably just going through the "20's". Whatever that means. Sometimes we just go through a moment (or much more) where "in the mood" is not what we need.