i think that's a thing you'll have to decide when you're there in the situation.

Wouldn't you feel a bit awkward just watching them? get stuck in? no strings attached just a bit of fun I say!

your choice really.
if you want to like you say, then go for it.
and if you can't just sit and watch and want to join in, then join in.

If they agree and if you want to why not?
I mean, if you use protection and are aware of consequences and complication that may, or may not, occur...

i'd go for it! haha why not?

join in

Perhaps you should just rub one out while they do it at first...That's what I would do in this situation.

Yeah but surely you'd want a bit of stuff done to you aswell? don't know about you but just "rubbing" someone isn't going to satisfy me when someone else get's penetrated or is penetrating, I'd want the same treatment, feel left out

its a spur of the moment thing