Marcia liked sex. She just didn’t like sex with her husband. And, it seems, he was no longer bothered about anything physical with her either. Was he getting something somewhere else? Maybe, but Marcia didn’t care. Was he now of different sexual persuasion? She doubted that, but couldn’t care either way.
So why did she stick with Tony? Simple... he was her meal ticket, she had status and a very comfortable life. She had a child she doted on, when she wasn’t getting laid.
She had the regular attention of two men who wanted her. What was not to like?