Some people believe love and sex are interchangeable. Some believe they are different concepts. At this point, both are subjective concepts. Neither supporter should try to correct the other because of it; everyone interprets such a broad topic in a different way.
That's my perspective. Personally, I don't think it matters. Live your life, love who you love.
But honestly, homosexuality isn't that difficult of a concept in itself. It's male x male, female x female. If Pokemon can understand humans, they can understand that.
...also what do you mean, "Meloetta said", Anna?