As mentioned, need to be in solid relationship..wife and I had started talking about other sex partners and I told her one of my fantasies was to see her with another man, and since we are in deep south USA, a black man..After she understood it wasnt because I wanted another woman, she opened up a bit. She was basically shy, but I started getting her sexier clothes, took her to nice lounges etc, and finally one night we met a man (in her same profession) and joined him at a dance place in a nice hotel. He asked her to dance and from there our life began. He was soon touching her butt, pulling her into him, nibbling her neck and she was happy to accept it. We went to leave and he came out with us,them holding hands..She backed up agains our car and he put his hands up her blouse, kissing her and playing with her breasts (no bra). He was a white man, but we soon broke into the IRL
That started our adventure, many wonderful memories.