Been married 20 plus years and she started with us dating having male "friends," that would buy her gifts and pay for stuff for her, found out that they were her friends with benefits stable years later; less than a year into our marriage and I share her with my best friend (we'd shared girls-his, and been bi together in the past), wondered if sharing her meant that they would be fucking more than I would be there for, turns out, yes, they did, and I enjoy sharing her and having her cheat on me.