Despite our own internal confusions, there are certain scientifically proven traits we do seek in mates that are more related to biological imperatives. We are subconsciously drawn to excitement and arousal, fulfilling gender-specific arousal triggers, a sense of humor, and masculine and feminine voices.
Research shows that while smiling and expressing happiness can make people like and trust you, when it comes to relationships and dating, this is not always the case: men find smiling, happy women most sexually attractive, but women tend to rate as more attractive those men who express pride (i.e., competence and self-assuredness) and shame (lowered gaze and awareness of social norms). At least initially, expressing happiness is theorized to convey a lack of status or dominance.