My wife, who was my GF at the time, told me later she did it to get me to quit bugging her about about it. This is what happened.
Keeping in mind she was 29 or 30 and we all had a lot of sexual energy we kept busy sucking and fucking until all were satiated. He thanked us profusely and left. We collapsed in bed asleep. In the morning I was afraid she would feel guilty and say never again. I asked her what she thought about everything that happened. She asked me if I had a good time. I assured her I had and she said great. I asked would she do it again and she said probably but it would have to our special secret and we must be discreet.
We continued in the Hotwife LS for 30 years.