I have posted my experience of this in another thread so I won't go through the whole story.
When I was with my exwife we used to sex talk a lot regarding ne receiving anal while she watched. It was a long story, but 5 guys had their way with me while she sat naked on my chest and arms. They then had her in every way possible. After we broke up I got with my exgf and she had the same tendency as my exwife. She always loved for me to be in a 69 with her on top, that way the guy, or guys, could fuck her from behind leaving me to do whatever I wanted with his cock or balls. At first it was simply putting his cock back in as it slipped out, but that progressed to sucking etc.
Wild times