Do guys like having their nipples licked/sucked?

I think it depends on the guy. I've noticed more "macho" men don't seem to like it. They seem really uncomfortable with it. I don't know if it feels feminine to them or what. But the men who are more "thinkers" (for lack of a better word), romantic type guys, they seem to really enjoy it. But obviously that isn't true for everyone. Just my experience.

And yes, I do like sucking or licking a guys nipples. I just see it as an erogenous zone. I don't think there is anything weird about doing that. His neck is an erogenous zone too. I have no problem kissing or licking that. So nipples don't bother me.

I absolutely LOVE playing with a guys nipples

I always found this amusing when a girl does this to me. It isn't a androgynous zone on men so if they get excited about it it is purely psychological. I don't but I wouldn't tell a girl to stop either if she finds it entertaining I usually try to give her a finger instead and then my lips. Something to lead away before I get bored.