I’m horrible at explaining, but if you are asexual for example, you can still fall in love with people, but not want to fck them. The other way around works too, say you’re aromantic, you can want to fck people, but not want to go into a relationship with them. For most people (afaik) romantic and sexual attraction are the same, for example, bisexual people are likely also biromantic. This is a very simplified explanation, hope it helps.