Physiology behind Cuckold

Was a time I thought of Cuckold as simply another play on the thinking behind a threesome, but a recent experience has got me thinking - Perhaps it is simply role reversal, regardless of 21 century woke, men are traditionally "hunter Gatherer" , but with the couple I met, roles had been completely reversed. She had the better job, most money, stronger personality, and throughout their whole marriage she made sure her knew. On her orders, he had no input, but simply existed as her assistant. He served our drinks, prepared the bed, undressed us both, sucked me erect, licked her wet, watched as we fucked, cleaned us both after coupling, never spoke unless spoken to,  drove me home afterwards, and lastly thanked me, as if I had done him a favour. She is coming here for the weekend, and simply asked "have you a spare room for  Greg, I promise you he will be useful.