What’s the most attractive personality trait? It’s playfulness. In a study conducted by Penn State researchers – they found that both men and women find people who are playful, fun loving, and have a good sense of humor most attractive. Deep down, we may think people who are playful are youthful, healthy, and non-aggressive – other qualities we subconsciously look for in a long-term partner. Where did physical attractiveness rate on the list of most desired qualities? Ninth.