It's OCD not Depersonalization. I have OCD too and have had similar thoughts. If you like the other sex you wouldn't be disturbed by the thoughts. You have Pure O OCD like I do. Just like treating Depersonalization treating Pure O OCD involves you not forcing yourself to not think of the thoughts but rather divert your thoughts to something else. You can't control what you think but you can control how you react to your thoughts. First you need to determine if the thought is irrational or not. If it is then decide before you have the thought again that it is irrational. When you have the thought recognize it as an irrational thought and then divert your attention to something else. For instance when I have an irrational thought come into my mind i divert my thoughts to kittens. (random I know but it works). Focus your thoughts on something that is going to keep your attention. Anytime you have this thought continue the steps of diverting your attention. It will take practice but eventually your mind will do it on its own. Hope this helps 