The thing about turn-ons is that many people assume they’re deep, dark secrets. In reality, though, most turn-ons have already been imagined, fantasized about, and even enacted by someone else — often someone completely unexpected.
Where does sexual arousal come from? It might be entirely chemical. In 1995, the famous sweaty T-shirt experiment led by Claus Wedekind, PhD, demonstrated that women are most attracted to the pheromonal smell of men with immune systems that are the most different from their own — and, therefore, those who will supposedly produce the most genetically viable babies. Think sweat is a weird turn-on? In 2008, a study showed that women listening to car engines revving experienced an enormous spike in testosterone, the hormone most associated with arousal.