If you watch porn with a man and a woman, you share gender with 50% of what's going on in there. You're 50% gay. Obviously if you share 100% of the gender in the porno that's 100% gay. Now you might be thinking if you watch porn with two people of the opposite gender then you're at 0%, but what they are doing is gay which means you're watching gay porn. Watching GAY porn is in fact, GAY. Now, if you were to watch porn between someone of the opposite gender and a transvestite, half man half woman, then you share only 25% of what's going on in that porno which means you are 75% less gay. That's the transitive property