[karlhein]

The piece de resistance with many older guy-younger wife situations which you might get ask to join, particularly if you are young and have a perpetually hard dick that Mrs Robinson likes, the lady giving her moiuth, her pussy or her butt to you, and presenting it to hubby as a present. I've never been in a situation like this when he wasn't jacking his hard dick.
The single most common situation is that besides watching her get fucked, many couples have never done anal. Often your cock is getting her anal cherry. Just make sure the hubby gets a winking brown eye before the night is over.