You may just need to educate him or her. Up to that time, I was having sex at least once a day. Since my surgery I could care less if I have sex. I would classify myself as frigid. Another big issue for some women who've had hysterectomies is female sexual arousal complaints.
Women sometimes lose interest as a result.
In either case, whether your problems are a pure lack of desire, or lack of desire due to response problems, there are potential treatments available, and you should speak to your doctor about these. My experience is that many doctors seem to feel that post-menopausal women don't need a sex life. This is a myth. There are many reasons why a menopausal woman may be more sexual than ever. Sex does not have to stop in the golden years, and don't let anyone tell you it does.