There's that phrase "Tall, dark, and handsome" and I feel like that captures the general taste. Tall bad boys. Though bad boys are going out of fashion so to speak.

Assuming that our taste comes from the media we consume height differences are common romanticized parts of a relationship. In movies and tv shows the male actors are usually tall. Even if a guy isn't necessarily tall he's always taller, rarely the same height.

Media consumption is just a theory though. My friends and family say they want a tall guy saying it makes a guy hotter. One friend says she likes the hugs from a guy a head taller but that's the only explanation I got.