If cuckolding is of interest: I have posted on my profile page 2 albums of my ex-wife, and narratives in the Message area of my experiences in being cuckolded by her (now pushed back to page 3). enjoy
I was reading your post for the reasons of why a man is turned on by seeing another man fuck his wife or girlfriend, especially as it relates to watching a man's cock pound away at his girl's pussy. I agree with a lot of what you wrote but have one addition that was part of my experience, in that I got to see another man enjoy those intimate things about my girl that I am supposed to be the only man to know about. That was an incredible turn on, watching him undress, French kiss and put his mouth right on her fully nipple and suck like crazy. Afterward everything that was sacred between us had another guy into the mix and it became part of my thoughts and got me hard every time I remembered the event.