We choose cosmetics that match our genetically-determined odour preferences. [Agnieszka] Sorokowska and her colleagues have shown that it is possible to make assessments of someone's personality based on their choice of fragrances. It suggests that guests of Louis XIV might have been able to pick up a thing or two about the king by sniffing the air upon arrival.
— Sorokowska is a psychologist at the University of Wroclaw, Poland. Read more in Why single people smell different at BBC.