My friend's girlfriend/fiance

[carl1983]

The ten year wait thing is all that's really odd about this. Normally these types are glued to the alter at 20.
If this type of relationship were universally practiced, we'd wipe out STD's in about two generations, so I'm not necessarily knocking it....that being said, I wouldn't be hanging around for a decade to get laid.
I fully expect your buddy to break the news about his bit on the side during your next heart to heart.