Do you mean within each relationship, or more like scenarios when everyone is in the same room?
My boyfriend and I are the kind of couple that's really physically affectionate out in public and whatnot. We're always holding hands, standing around with our arms around each other, etc. My husband and I tend to be more the snuggle on the couch at home type, without as much of the touchy-feely when we're out in the world, though I've noticed myself being a lot more affectionate with him at those times lately, too.
When we're all hanging out together, I'm not cuddly with either of them. I would love to someday be able to all curl up on the couch together, but we're just not there yet and that's okay. They've certainly both seen me hug and quick-peck the other, but that's about it.
As for their physical touchiness with other people, I know my boyfriend is snuggly with friends when I'm not around, and that's just fine by me. My husband isn't so much the type who would be cuddly with anyone he wasn't dating, and at the moment he isn't seeing anyone. But it wouldn't bother me if he did have other people in his life he was affectionate with. We have some mutual friends who we both pile on the couch with, and it doesn't bother me at all to see him cuddle with a close girl friend of ours.