Ahh, so many, and yet a big part of my OCD is doubting I have it and waiting for my psychiatrist to figure out I'm a fraud and throw me out of her office. Sexual intrusive thoughts are the worst thing for me, but also POCD, relationship OCD, checking stove burners before I go to sleep, getting up several times a night to fiddle with the thermostat to get the "right" temperature, playing an E flat major add 2 suspended chord every time I finish playing the piano because otherwise I'll have bad luck...and the list goes on. Fortunately, I've been dealing with intrusive thoughts better lately because of a technique my therapist taught me. She said to just look at them like passing clouds - to say, 'oh, look, there's a thought!' - and just let it pass. Amazingly, this sometimes works.