Ive been very horny lately...?

Im a guy, and I know what your thinking (of course he is -_-) well I am not like that, and have never been, Im not the type to go looking for sex if its knocking on my door or things get heated then fine im down but other than that it doesn't seem to faze me one bit...until now. It seems that every hour that goes by I crave sex like im on X is it normal?