I really don't think it matters WHY you aren't getting sexual interest from your partner. It all feels like rejection. Here again, we're going to have men tell us that their suffering is worse.

Men could pleasure women in other ways even if they "can't get it up" - yet overwhelmingly they do not. The fact is, you do not know what's going on inside other people's bedrooms - particularly for the women - because studies have historically centered around men's experience. Because men conduct them.

As for women losing interest in their partners at high rates - you may want to dig into why that might be. Overwhelmingly, men become simply another drain on our physical, mental, and emotional resources. An extra child to take care of. And guess who women DO NOT want to have sex with? A man who feels like her child.

https://medium.com/modern-women/why-she-wont-have-sex-with-you-anymore-1a7b8a8b295e

This article is also insightful if you actually care to understand some of the other issues.

https://www.mindbodygreen.com/articles/women-losing-interest-in-sex