Like Hamster-Bamster, I don't really know about the OCD side of things, but being turned on by two women isn't unusual or weird or makes you lesbian or anything. My wife is very similar in that she gets really turned on when two women kiss or by watching lesbian porn, but would never be interested in trying it. So as far as that goes, enjoy it because that makes you who you are, don't worry about trying to fit a category.