Hairdos can always be changed anyway, generally speaking. What should matter, are those things that cannot undergo change or shouldn't change.
Personally I like really short hair on guys, shaved even. I'm pretty sure I wouldn't turn down a guy because of his hair if I liked him but it's just not my thing. I guess it depends on both the guy and what suits him best and the girl's preferences. Like the ladies already said, if the guy can pull it off and if it's nice and clean, it shouldn't be a problem.
"The right time is any time that one is still so lucky as to have."
maxmax-
I guess you're sort of agreeing with what I'm saying, but I'm wording it differently. Obviously if "you" can't do anything to change it, you have to accept it, but it's more worrisome where it counts with your partner/potential partner if it's seen as undesirable. If you can change something as easily as hair, you shouldn't have much to worry about.
Honestly, I'm not into it!
"It's all George's fault. All that talk about impotence. He got to me. And that orgasm stuff: orgasm this and orgasm that. It's a lot of pressure!" Jerry Seinfeld