Thanks for your replies.
I realize that there's no way of knowing what the consequences are, regardless of how strong your relationship is. I know that's the reason I asked in the first place...because I really DO love and want to spend my life with him, as does he. If there is a slight chance that it could destroy us, then I don't want to take that risk. THEN AGAIN, everything we encounter offers a risk. It's all how we handle what rolls into our path.
It's obviously a dilemma...on one hand, I trust him enough to share this experience with him, as I feel we will both be incredibly turned on by the experience. I think it would be a lot of fun. At the same time, is it worth the chance that we look back and wonder what we were thinking?
To those of you who did respond, thanks for not passing judgement. The truth is, before I met this man, I never thought I'd be thinking a lot of the things I've thought. He has opened my mind in so many ways, and it's refreshing.
If anyone else has a story or advice to share, I appreciate your thoughts. Thanks.