BabyDragon, If you are stuck in a man's body, then so am I.
Although my husband was the one to bring up the idea of swinging, I have become so open to the idea of swinging and the possibilities that we have had a couple of encounters that really shocked him.
My husband sounds very much like yours and the best thing I can tell you is to just casually bring up scenarios and pay attention to how he reacts to them. If he doesn't seem receptive, drop it for the moment, but at least the seed would have been planted for you to bring up your desires at a future date.
Lori