Help with story

I read a story ( pretty sure on Lit.)
Synopsis was a man's wife would sneak off to be with her Mexican lover, husband would pay a sitter to sit with kids while he secretly followed her in a cab and would secretly watch her.
One scene had her in the backyard of her lovers at a party where she ends up getting gangbanged by the men there while the women sit around and talk. The husband has secretly followed her and watches from a gate.

Any help would be appreciated.

Interesting!