It can be fun but I think in real life there needs to be A LOT of communication between you and your husband about, (loath I mention it)...boundries, safe words, are the other two gonna be friends or random guys, hygene lol or not , as mentioned above are the guys gonna play with each other too...Do your homework...
All that said. It can be beautiful. & really bonding. I find The Ben Dover series of porno to be quite good re: this topic