I don't know about other guys. I started growing a mustache because too often, when I shaved, I'd nick myself on the lip and a large "white-head" would form at the edge of my lip. That made me feel very self-conscious and unattractive, as it felt HUGE, and I've wanted to be married, with kids, since I was four, at least.
Then the outer ends of my mustache started going gray, and in dim light it would look like I had Hitler's mustache. And I'd learned to shave down, not up; this other was is just as close as an electric razor, and on alternate days, when I use the electric, no one ever says it doesn't look like I shaved.
So guys may have other reasons besides obsession for having a mustache Sometimes it's just not wanting to look bad and feel bad.
I know, right?! I just went to a little girl's party and she gave out fake mustaches as favors! I mean, just add to the long list of strange obsessions; mustaches, 1D, iPods, cell phones. Just stupid things people love!
I'm 14 and i had one since i was like 13 lol :p but everyone thinks its just so cool but idk why so i just shave every night cuz i think about if a girl kisses a guy with a hairy lip she probably wouldnt like it so im like hmm either keep the stache or shave and have girls liking to kiss me.......well im a 14 year old teenage boy so i didnt have to think much on that one!!!!
Well during the 1900s judgmental folks liked clean-shaven people. Everyone else who had lots of facial hair or long hair was a "hippie" and "their kind was not to be served here". So I guess it's part of modern-day teenage rebellion. Just like bacon, it being so unhealthy. Most people probably like them just because everyone else does. Mob mentality right?