I could see how you would think that, but it isn’t “normal”, it means you don’t feel any sexual attraction at all unless you know them well, and even then you may still not feel attraction, not that you just won’t have sex unless you know them, sometimes you may feel sexual attraction and not want to have sex with someone. I’m not saying that you don’t know this, or change your opinion, I just figured I’d give some insight you may not know