That seems like a very common OCD symptom you are dealing with. I have had intrusive sexual thoughts like that, and I have been afraid there was something wrong with me, too. Now I have a healthier perspective on it, and I know that when I have intrusive sexual thoughts (or any other intrusive thought) that it is my OCD, NOT ME. OCD has a funny way of making you think of things that are the opposite of what you want to focus on. If you can take a step back and realize that, you have already started winning the battle.

I would see a psychiatrist and a psychologist about this. Intrusive thoughts can be very disturbing and upsetting. Getting the proper medical care can greatly reduce your anxiety level and make you feel more in control. I know because I've been where you are and I am currently receiving psychiatric treatment and I'm doing much better.

HUGS!!!