There are 2 things to remember: psychology and physiology.

Physiologically you may need it once in a while even though nothing wrong will happen if you don't (except your abilities in that part will decline) or have it a bit more often - your body will adjust to that.

Psychologically you can want it "all the time" unless you have more urgent and/or interesting things in your life - like hobbies/work/hunger/etc. A dog starts licking his dick when he has nothing to do. If you follow your "desires" completely - this may not end well for your physiology either.
Sometimes you may be in need of attention and care more than anything else.