I prefer friends. Especially good friends. Preferable MY friends.
However, that remained a dream or my wife's two steady lovers can be considered as friends.
Good friends come along more often.
And when it becomes usually that they have sex in front of me, not asking me having problems with it, just doing it, would be a dream.
When I was a student, my roommate and I rented three rooms, one of which was shared.
When my girlfriend (later my wife) also moved to that university town, and my roommate was not there, my girlfriend and I often walked around naked. Just to have physical pleasure with each other.
Once, completely unexpectedly, my roommate came in. Surprised, my girlfriend covered her crotch. My roommate convinced her not to do that.
Over time, he took it upon himself to play with her breasts and nipples. Whether I agreed with it or not. He and my girlfriend enjoyed looking me straight in the eye while doing so. That was as far as it went.
My tennis double partner went a step further.
He seduced my girlfriend into undressing completely and then brought her to orgasm with his hands. I have never forgotten her French kiss with him.
Decades later.
After four visits to our club, there was a black man who seemed to be enchanted by my wife. It didn't come to fucking because the free condoms turned out to be too small. We kept in touch and two months later he visited us.
He hadn't followed my directions and was therefore an hour late.
After fifteen minutes, I left my wife and him alone to start eating the meal that had been largely prepared. When I came back from the kitchen, this was the scene I was confronted with, and I didn't hesitate to take a photo.
Two visits later, it was he who ordered me to put his cock (without a condom) in her pussy.
I took the second photo minutes later.
