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.