When I was a young boy on the playground I’d hear the word “fag” tossed around. I barely knew about sex between men and women at the time. I inquired what fag meant. It was explained to me and I had to ask how would it be possible for two men to have sex. I was told that they stuck their wieners in each others butts. I was immediately repulsed and disgusted at the thought of such sexual perversion. Nobody had taught me that I should consider this behavior to be disgusting or repulsive, I was born this way. I wish people could learn to be more tolerant and accept me for who I am.
I would also add that parents likely teach you to keep your own hands away from your crap, which would probably affirm and reinforce it further.