For us, it was a long, slow build-up over time. In context, my wife was never faithful, even from the time we were dating, through our engagement, and into married life. She had a number of affairs, all hidden, though I suspected her of some of them. So she had/has a proclivity for sex with other men at the core.
Our path was hundreds of fantasy scenarios, whispered into her ear, progressing into sexy dressing, showing off, exhibition, sex in front of others, “soft swing” and experimenting at bars and clubs, where she danced with other men, allowed them to touch, steal kisses, and explore. Ultimately it was on her time, her decision, during a combination business/pleasure trip, where she picked up a man in the hotel lounge, brought him back to our room, and they fucked each other’s brains out.
It took two to three more years of experimentation and touch-and-go stuff before she got comfortable with the idea of the whole hot wife thing.
Tonight, she’s on a business trip, with pleasure on the side, getting fucked senseless...