My wife once went out for drinks with a few of her coworkers. Eventually, she was alone with just an older married guy who always stole stares of her nyloned legs and shapely rear. He whispered to her, "Hey, if you ever want to have an affair, just let me know."
She explained that she was happily married and left in a huff.
She told me the entire story when she got home, disbelieving that any man could be so lame in the seduction game. The irony was that we shared her body with other men and we were constantly on the outlook for new sex partners for her. About two years later, she got a better job offer and she gave two-weeks notice. She liked that she was leaving a 12-person company for a large company with hundreds of employees, if for no other reason that it upped her chance of finding suitable men to get between her legs. She mentioned the coworker who made the lame pass at her as the only male at her old job who showed any sexual interest in her.
Well, he became part of our pillow talk that night, with my detailing how much he would have love to have had that affair with her, with him seeing her naked body, feeling her soft breasts and ass, sniffing her perfume and sexual scent, hearing her moans, exploring her vagina's inner fold of skin and wetness with his naked cock, erupting inside her body, and leaving his DNA behind. She enjoyed this fantasy talk, so much so that we decided that she should let him fuck her, not repeatedly over several months, but just once. She didn't know how to give him the offer of her body. I gave her a simple speech.
She asked him to remember the time he had asked her about having an affair with him. He got all-apologetic, claiming that the drink had been speaking. She shut him up and revealed that my huge sex fantasy was to watch another man make love to her (but didn't reveal that we had lived fantasy many, many times before). She went on to ask if he would be willing to help her make my fantasy come true, as my birthday approached. He was willing.
It turned out that he had an amazingly thick cock, although only five inches long, but crazy thick. So thick that she could not fit it in her mouth, so she licked it like an ice-cream cone. For an overweight guy in his early 40s, he gave an impressive pounding. Afterwards, we told him that maybe next year they could have a repeat performance. (It never happened, sadly.)