Demisexuality is a sexual orientation. Demisexuals report to ONLY feel sexual attraction toward people with whom they have an emotional bond.
Although many people don’t like to have sex with people until they have formed some level of connection, most people still feel sexually attracted to people in the absence of an emotional bond.
The type and depth of emotional bond required varies amongst demisexuals. And it is simply a prerequisite for sexual attraction to occur, not a guarantee.