3 sum with wife

We have been married for 18 years and were together for 10 years before that. we broke up for about 6 months before we got married and dated other people during that time. We recently were discussing what happened during those 6 months, although we didnt have sex with the other people she did give him a bj and swallowed. For some reason it was a huge turn on for me. We have been discussing having a 3 some, she wants fmf and I want mfm (go figure). We are both very secure in our marriage and dont think jealousy would be a problem. I would like to hear about other couples and their experiences in having 3 somes and how everyone felt afterword and did you guys do it again.