What does it mean to be a handsome man? The answer will vary over time and from culture to culture. To satisfy your scholarly interest in the wholly academic study of body aesthetics, BuzzFeed conducted a sociological survey of current dominant male beauty standards in the USA, Mexico, Brazil, South Africa, Nigeria, Turkey, Italy, the UK, India, South Korea, the Philippines, and Australia. It also speculated on future trends in male beauty preferences worldwide.
Readers with an interest in the social sciences may wish to conduct further research on their own. A literature review is the starting point of all serious scholarly study.
But the text is kind of depressing. It's sad that global standards lean toward homogenization of beauty ideals, and that Caucasian features tend to be preferred. There are beautiful men of all races, body types, and (as I discover more every year) age.