I've noticed that when I'm getting sex regularly I'm pretty horny most of the time. Then, if for whatever reason that stops, I'll be super-horny for a week or two and then my sex drive will just sink, and when I have the opportunity to have sex again it'll take me a couple of tries before I can really get into it again with no problems. Is that common? It's kind of a pain.
It is true the whole use it or lose it thing... to a degree but i will tell you stressing about it is more likely to cause you sexual health problems, honestly if your not having sex but you still want to be "up for it" just make sure to eat healthy and exercise and that should have the same affect with out having to obsess about sex when your not horny. Hope that helps