Lust in itself isn’t bad, but when you only talk about how sexy you think a woman is, it just makes her feel like you don’t actually care about her for her. She feels like you just want to get your dick wet and she’s the most available option. Telling her she looks hot/sexy is nice, but mix in some other stuff too. Like how nice you think her laugh is, or her sense of style, or how she does her makeup, or literally anything else.