She's been getting a submissive fetish

"Well, for a number of years now, I've been fantasizing about, shall we say, losing some control in bed?"

"You're a submissive?"

"I'm not sure, really. I didn't used to be, but recently it's all I can think about, and I've been hornier than usual."

"Tell me, have you had sex since your husband died?" Dr. Vierre asked.

"Of course not!"

"Hmm, that probably explains the arousal, you're pent up, most likely very heavily."

"What about the submission?"

"Oh, well, that's pretty easy. I already know about your relationship with you son. When you got married, you were expecting a relationship where you would have sex and be equals. Instead you've now got a relationship where you don't have sex, and you're the dominant part. You're craving a relationship where you're submissive, and have sex." she smiled at her patient. "It makes more sense when you line it up like that, doesn't it?"

"So, I just want what I don't have? The grass is greener and that stuff?"

"Not necessarily. Just because we can see its cause doesn't mean that it will be fickle. I recommend releasing your desires. Be dominated, and see if that makes it weaker, or stronger."

"What if it makes it stronger?"

"Then you get to have a whole lot of fun. There's nothing wrong with being a submissive, and if you like it, I'd recommend pursuing it."

"Okay... but who can I get to d- experiment with me?"