A turn on is something that makes specific groups of people sexually
stimulated ( horny ). Also known as fetishes, people have very different turn ons and while some may be music or clothes some people might like their
sexual partner to be aggressive towards them during/before
intercourse. The more dark and aggressive type of fetishes are called BDSM, which stands for Bondage, Discipline, Domination, Submission, Sadism and Masochism