Asking for a friend: My partner and I go months without sex. He’s not fussed but I don’t want to spend the rest of my life without intimacy

Q: My partner and I have been together for over 20 years but, for the last five or six years, we have rarely had any sexual activity. Most of the rest of the relationship is great, and I am happy overall. We have been through some stressful times, but I find it harder to feel connected without the physical side of a relationship. My partner isn’t too fussed and says it will resolve itself over time, but it’s been years now. We are still young and I don’t want to spend the rest of my life not having physical intimacy. Sometimes one of us will try to start something, but the other person isn’t in the mood. We probably go months without having sex, and it does upset me. I feel ashamed that we are in this situation, as I’ve talked to my friends but they don’t seem to have this issue and don’t offer much advice. They say that they are intimate with their partners a few times a month and are happy with this. I would think that would be better than what we have at the moment but it still seems low to me. Is this normal or is it just our relationship?