She was 30 and I was 40 when we married. We enjoyed two mfm threesomes while dating as well as me watching her have sex with her ex BF (I sat in a chair at the foot of the bed - awkward for both of us guys but she loved it). It was my wife who first broached the idea that there was a married guy at her work with whom she'd love to have a long term relationship with instead of threesomes with him and me in hotels. Would I be good with it, she asked me. My erection gave her my answer a few seconds before I spoke. This was the 1990s and neither of us had ever even thought of "cuckolds" and all that stuff. My wife's two tween-aged daughters lived with us so we had to be creative. And we (and her boss) had to spend a little money to make the whole thing work for 8 years. We wanted him in our home in our bed with her (hotels are fine for the first few times but can be a pain in the ass, too) as their relationship grew. Eventually we added a door between our master bedroom and the extra bedroom, but mainly he spent the weekends with us when their bio dad's custody weekends took place. Or when they traveled together for work. The emotional side of things is much more challenging (as well as rewarding and fulfilling). I guess I'm a cuckold but there was limited overt humiliation and all that whiney cuckold stuff. And to the original poster's question, sometimes it was just for an hour or two. Or less. At breakfast one weekday morning after her lover had spent the night, she asked me if it was ok to give him a house key. But he always called first so we could be sure the girls were in bed. Those were the nights when she gave me seconds after he left (lovingly, as she knew I'd have a quick but intense orgasm, then go down on her and give her another orgasm). All of this can be extremely fulfilling but takes work and hubby''s commitment to fit into the marriage.