What do men feel watching porn?

Ok im slightly confused and its no thanks to my friend. My best friend is gay well at least he thinks he's gay but ever since he thinks this he;s trying to make me gay also. I just cringe at the thought of him coming onto me and really makes me sick everytime i even consider such thought. However recently we were having a discussion about straight porn and he told me that it was not normal to enjoy straight porn. I told him that i love imagining im the man riding the woman in the porn film and i reach orgasm instantly, however he says this is wrong and i should not think like this? Is he just jealous that im not interested in men? He's making me question everything now. What do i do?