She can't cum during sex

"You see, Dr. Vierre, I've been having trouble with sex."

Wendy looked at her and made a guess. "Your husband wants it too much?"

"No, it's not that, but no matter what he does, I can't cum."

"Have you talked to him about this?"

"No, I just fake it."

"How long has this been going on?"

"About five years. Before that I had no problem cumming."

Wendy nodded, but she didn't know what was wrong. She needed more information.

"What about masturbation? Can you achieve orgasm on your own?"