How do you feel about relationships and being an "open" couple?

so how do you feel about being a sexually open couple. My husband and i are not swingers by any means but we have had a foursome. Would you feel comfortable doing this? i see human sexuality as beautiful thing. I have no regrets and if the opportunity presented itself again i think we prolly would go for it. it hasnt affected our emotional relationship. I see sex with people you dont love a strictly non emotional act of human nature. are you open? do think this could lead to later problems? if you are open do you enjoy it?