I do

I wouldn't say I think/fantasize about other men, but I do enjoy watching bisexual porn scenes (mmf or mmff, but some larger groups, too) particularly if the woman is really into it, and getting off on watching the guys together. I love it when it is fulfilling a fantasy for a woman (or some women).

As a much older guy, I never even questioned my total heterosexuality until I was just over sixty years old and while watching girl do a bad job of sucking a cock in a porn video one night, I got to thinking that she was solo bad I could even suck a cock much better than that. I thought about it for a couple of weeks until I decided to try to see if I could even do it. So I called a friend that had told me once that he was bisexual and enjoyed a nice cock in his mouth.
We met a few days later and I asked about it and he said yes it was true. So I asked him if I could try it on him and was very nervous when he said yes that would be great. We were alone at his house so we started. I took off my pants and shorts and shoes and so did he. I sat down in a soft chair and he sat on a small stool between my legs and started licking and sucking my cock and oh he was good. Just when it started to approach that point where it was really good and I wanted to start going for a finish. He stopped while I was aroused and said now it is your turn. At that point I would have would have done anything. He stood in front of me and I sat on the short stool looking right at a nice thick uncut cock about a little over six inches long. He put the head of it against my lips and put one hand on the back of my head holding it still while he slowly pushed his dick into my mouth.
Very slowly and tentatively I started to run my tongue around the head and then to suck the head deeper into my mouth. To my surprise, I found out I liked it and went on to suck him like I liked having mine sucked. I even finished him off with my mouth and made him cum in my mouth and as luck would have it, he was a big bummer. It was a little salty and a little sweet and I liked it as I swallowed it.
Now I figured out I just like oral sex with men and women, both giving and receiving. However, I don't want to kiss a man or cuddle with him, just suck and be sucked. Women,everything goes.

I enjoy the female form to much.

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I have great abs, some men have six packs I have a keg!