Demissexuality is not a sexuality, it's just normal part of a relationship

I partly agree. I need to have a strong bond with someone before I feel comfortable enough to be intimiate but I don't refer to myself as demisexual. I can see why people have labeled that a sexuality though as it's (from my understanding) more common especially nowadays that people have sex before they form a bond with someone, or have sex without ever forming a bond with that person. People use Tinder for one night stands everyday, and a lot of people take it as a personal insult if you don't wanna have sex around the third date.