Are you asking if a tarot reader could guess your orientation using the cards alone?
That may be an unanswerable question.
Can people usually decipher your orientation without cards? Some people have sharp gaydar.
So I ask myself, what if you were on the other side of a screen, where they could not see or hear you? Or... if it is an online reading, like the readings I do.
Sometimes the cards give me two male characters or two female characters for a relationship reading and I ask myself if it is a relationship between two partners of the same sex. But very often it turns out not to be, so I have learned not to make assumptions from the cards.
My question for you is why do you wish to keep it a secret?