No. Never have and never will, ladies only for me.
Sucked one once, but before I met my now wife. Sadly, never had a guy do me. I would have loved to explore this a LOT more as a young man, but it was the height of the AIDS epidemic and it was still a death sentence. Wouldn't do it now, as my wife and I are monogamous and I would never cheat on her. And yes, it would be considered cheating in my case. So I write stories about it instead of actually doing it.
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I'm not married (I'm divorced), but I would never suck a guy's cock and not tell my partner. That simply is not ethical. In fact, I would not do it unless I discussed it ahead of time with my partner(s). If a partner did something like that behind my back I would find it completely disrespectful, and I would not want to treat someone like that, especially someone I really cared for.
On a business trip, I sucked she-cock. She was happy, and that made me happy, but I was neutral. Yes, neutral
On another trip, her cock was much bigger. I choked. Still, I want to try again. I have no desire to kiss a guy, but I want a cock in me. I'm just adventuresome and curious that way.
Where I'm from is a very small town in a rural area. It is deeply bigoted on such topics. That said, I have a gay friend living there. Fully out with his lifestyle, he lives way out in the sticks. Though the highway runs in front of his house, his house sits up a steep bank somewhat high above the road and he has privacy to do as he pleases. You'd be surprised at how many "good" married men get up that steep hill to see him when he's sitting naked on his front porch giving oral!