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.
Not in the contest but Festively Flashing: Disrobed
Festive Flash competition entry: Amy's Mom
I get dicked by a federal agent in Recommended Read Dick Job
I pork everyone in my other Recommended Read, Pork by Northwest
Card catalog? Hard catalog! My library
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.