Hmm... I can only think of 3 things that are a huge turnoff- if he smokes, drinks heavily, or uses illegal drugs.
I have a mild allergy to cigarette smoke (and am highly allergic to pot), so smoking's out. (Not to mention that yeah, I don't like the smell, or what it does to one's looks. I'm not a looks whore, but one should cherish what they have.)
For the drinking part, I've no problem with a glass of wine with dinner. But, if Friday night means partying and getting drunk, that's a problem. When I talk to you, I want to talk to you, not the alcohol.
As for the drugs, I'm just so not dealing with it. I will turn you over to local police. I will not help you hide it, because when (not if) it gets out, my life will also be in turmoil. I'm not willing to do that.
Oh, and less important, but still nice, is that I don't want him married to the gym. Being fit is fine, but if you simply have to spend 3 hours every day at the gym, it's going to create a chasm. (Not to mention that it makes guys rock-hard, and that makes cuddling less soft and, well... cuddly!) And he has to have a nice personality. And be at least tolerant of anime, manga, and gaming. And... well... I guess I'd really have to think for more...?