Is this common?
I love watching my wife getting other guys off. If I have a friend over and I know he doesn't get laid much I ask my wife to get him off. handjob or blowjob. She loves attention so she doesn't mind. We've had threesomes with a few of her girlfriends and she's asked to finish them orally which I had no problem with.
She's very good with her hands and her mouth and I love watching my close friends go through the pleasure I get almost daily. Any other guys out there like this?