She could be right. Often, having promiscuous sex is a way to prevent having an intimate personal relationship. Kissing can enhance the illusion of intimacy with someone you know will not be around in the morning (or in 20 minutes). And frequency of the sex act isn’t what determines sex addiction; acting out takes many forms, including porn, masturbation, failing at relationships, app cruising, street cruising, daydreaming, etc. Hope she helps you out.