Loud and proud types who's personality is limited to stereotypes.
Anyone who identifies themselves as a twink, bear, muscle stud, leatherf*gs or some stupid cliquey bullcrap.
Dumb
Stoner/drunk/druggie
Party all the time type
Grossly immature (Teens and older guys who want to pal around with young guys are a big turn off.)
Communicates with me mostly in social media and text messages
Guys who can't balance between being too dependent on me or not spending enough time with me
All looks and no substance.
Too manly or fem
No class or self-respect
Untrustworthy
Has a history of many partners

Aesthetically I am turned off by:
Too skinny/muscled/fat. Can't deal with one extreme.
Overly masculine or feminine looking
Bad hairstyles/colors
Too much body hair
Tattoos
Ear gauges or anything that looks stupid dangling from their earlobes
Nose and mouth piercings.
Prince Albert (Y u do dis?!)
No butt
Well traveled b-hole
Moobs
Too young or old looking
Awful or no taste in clothing
Summer Teeth
Ugly butts

I've heard everything from 1 in 3 men being gay, to 10% of the male population. Thing is there's also bisexuals, trans, the plethora of made of Tumblr sexualities, and opportunists who will bang whatever is available who mess with the facts and figures. Sexuality in general has grayed out a lot and it seems like there's more guys willing to hook up with a guy if they're feminine enough or willing to do things that women wouldn't door whatever kink or preference appeals to them. If we're looking at men willing to have sex with other men, I'd say the number is fairly high, but if you're looking for a legit gay guy to be with in a ltr, you're pretty much screwed there statistically.