In fic, I go - Norway with Denmark, and with Sweden. Maybe with Netherlands (if he didn't, he wanted to). Anything else's variable. (Though Sweden and Denmark probably did it and deny it, and Netherlands and Denmark did it but don't deny it)

As far as roleplay goes, iceandheather has slept with... uh. Denmark, Sweden(s? we've had several), Netherlands, Spain, France (let's not talk about it), America, another Norway... I think I'm missing one or two others. This is all stuff that happened during play either on or offscreen; I tend not to just assume it has happened because that can be messy.