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You probably have a prediliction to an unnatural sexual fantasy. It could be related to the terms Watersports and Skat. Not that I am hinting on this but psychological influences are implicated in such situations. There are a few articles based on the Freud's theories of the infantile mind, which may interest you. Have a read when you like, just for interest. Nothing to be worried about unless these thoughts trouble you. Nothing to worry about your 'seduction' skills, as and when you enter a relationship it should manifest appropriately. Every person is different and not all need to come across as seductively female. You may speak to a Psychiatrist
on this regard to help you with coping with the situation and also engaging you in tried and tested behavior therapies which will definitely improve the situation.