I am formerly 100% straight, but was slowly turned to bisexual tendencies by my ex-wife. It started off with her convincing me to let her lick my asshole. Who would say no to that? The next step was her fingering my butthole. Then she would get me to ask for her finger. Things like: "You want it, don't you bitch?" She got me to start shaving my body smooth, or she would't have sex with me.
After a while, she wouldn't have sex with me until I got on my hands and knees first, so she could finger me from behind. She started saying things such as" You like the cock, don't you fag?" Much to my surprise, it started to turn me on. I was being trained to link this activity with sex. The first time she brought out a strap on dildo, I didn't even object. She knew what she was doing, went slow, and used a lot of lube. Any man who has been properly fucked in the ass knows there is no deeper orgasm than getting wanked while your prostrate is getting reamed.
Her foreplay would basically consist of me telling her stories about me getting fucked up the ass by a big muscular guy. She was a petite little 5 foot 3 inch beauty, maybe 110 lbs. Absolutely killer body. She fantasized about black cock, and about me taking it up the ass. Even though we are divorced now, those are still my main fantasies. And those thoughts never crossed my mind before I met her. In fact, I was quite dominant in bed. I was taught that sometimes doms make the best subs.