The husband is waiting for his wife to come home from work, she has gone for a few drinks with friends, but she is very late.
The wife has gone back to the home of one of her male friends to have sex.
The wife may ring her husband and let him listen, or even send him photos on her phone of her lover fucking her.
The wife will eventually go home and tell her husband what she has done while he is making love to her.
An extension of this is where the husband has to guess the lover/s in the photos corectly before she allows him to touch her.