I don't know... I think that it's a bit wrong to do it, because you're already dating one guy. If I were you, and I say IF I WERE YOU, I'd focus on that guy I'm dating, and drop the rest, so I can see if he's 'boyfriend material'
However... Dating means you're not really officially a couple yet so, I don't know if it's really 'cheating', but I wouldn't do it though.
By definition, its "technically" not cheating. But it is equally disrespectful, and should be treated as seriously as cheating. If I found out my girlfriend was flirting with another man/men, I'd be just as heart broken.
I consider it cheating if you are intentionally doing so. Also, if your bf/gf sees what's happening and asks you to stop doing it and yet you continue, then it's definitely cheating. I don't like the excuse that you don't realize what you're doing. I mean, I do believe it to a degree, but at some point it becomes increasingly clear that it's not just "friendly" conversation or touches anymore.