Can this be done in a healthy way? I feel like everyone is having threesomes and really exciting sexual experiences, even married couples, and it makes me wonder if I'm repressed or just missing out.

My husband and I have talked about it recently after we found out a couple we know belong to a swingers group. They invited us to have group sex with them/switch partners and it sounds fun but I'm not sure it's a good idea. We've only had one threesome (before getting married) and it was really good but we didn't want to keep doing it because we knew it could cause problems in our relationship. Now that we're a little older and more secure in our marriage I think it might be worth trying. My husband has said he doesn't want to see me having sex with another man but he's open to the idea of that part being private. Other than that we haven't come across any serious issues during our conversations.