My wife is sexually repressed from her upbringing. We've been married forty years and I've never seen her express any interest in sex. She had a stroke in 2002 and we haven't had sex since. Now, I'm not even sure my equipment works except for the ocassional boner when I read something that grabs me mentally.
Each time my wife became pregnant, she was actually ashamed to tell her parents and stated that "She felt like she'd been caught with her hand in the cookie jar". Her attitude was definately due to her upbringing and the fact that I never - ever - saw her parents express any kind of emotions in front of us - no kissing, no hugging, no nothing.
She has carried that "attitude" throughout our entire marriage and has never developed sexually. I've never had a blow job from her even though I've gone down on her for years and brought her to climax after climax which she thoroughly enjoyed. It's very frustrating at times.
So, yes, there are womwn that hold back their sexuality.