MASHABLE - Nov 17 - In online dating, height appears to be an immensely valuable currency. Author and "dating coach" James Preece says dating apps encourage us to be "incredibly picky" and to rule out individuals based on arbitrary qualities. "Tall men know that their height is a big selling point, so they'll mention it to attract women," says Preece. Salonee Gadgil, co-host of dating podcast The Swipe Hype, doesn't necessarily think it's a bad thing to swipe left on someone because of a physical attribute. "I don't particularly like long hair, and don't find men with long hair attractive, so I would swipe left. Does that mean I am discriminating? Not really," says Gadgil. Benjamin G. Voyer - a psychology and behavioural science professor at London School of Economics - says the allure of height boils down to evolution. "Height is a sign of health, and we are looking for health characteristics when we look for potential romantic partners," says Voyer.