Yeah, there was some study that had women rate the attractiveness of male faces, and the results found that the higher rated faces had more feminine features. The study concluded that this may be because more masculine features indicate higher testosterone levels which can indicate the tendency for aggressive and unstable behaviour. Also, the more vulnerable looking cute men may key in to a maternal instinct in women to nurture them. Atleast, that's what the study said. However, there are some very masculine traits that are universally desired by women, strong jawlines, thick eyebrows and a muscular body (although really big guys scare me).
Also, while we may rate a guy as attractive, that doesn't mean that we are necessarily attracted to them. I can appreciate the beauty of pretty faces like leonardo dicaprio's, but he is definately NOT my type.