Long hair is excellent if it's always clean and well taken care of. It also makes me appear at least 5 years younger (often 10) because I use 30 day dye (natural instincts) to keep the color deep/even and the hair shiny as well as very soft to the touch. It also hides as well as prevents premature eye crinkles which adds to that effect.
Mine goes about halfway down my back and I really couldn't count the number of times a girl came up to me and started a talk about my hair or wanted to touch it. I've actually had to learn to not "jump" when it's unexpectedly touched if I'm in line somewhere or sitting at a bar. Girls will sometimes be a bit forward and touch it from behind (it's almost always 2+ girls in the group, I guess girls get more brave and avoid ASD when they do it with girlfriends there). When that happens, I always bust them on it "i didn't say you could touch my hair" or something similar to start building attraction as well as establishing boundaries.
It breaks through the "anti-slut defense" because no one thinks it's slutty for a girl to go and want to touch nice long hair on a guy. It gives her a reason to talk to me as well as start with IOIs in an "innocent" way. Also, that explicitly gives me permission to touch her hair and (accidentally) touch her ear or neck while I'm doing it. If I'm in she'll automatically tilt her head a bit. If she's just into the hair or I need to build more attraction, she'll sort-of freeze up a bit when I do it. Either way I don't care because other girls are seeing that I'm comfortable with women and they always see kino going on when I'm around. It's instant Social Proof even though I don't know the name of the girl(s) I'm talking to. (I'm new here but many people may have noticed that I'm much more interested in how my true personality is seen by girls watching than the girl right in front of me...the value of getting 5 women curious vs bagging the 1 woman in front of me is 100x more important)
It also provokes some testing at times as well. Girls will sometimes bust on it to say it's girly and see how I react. Also, amusingly enough, I've had a few girls say "you'd be really cute if you didn't have long hair" which means the opposite of what she's saying. A girl doesn't wander across a club to touch long hair if she's really turned off by long hair on a guy.
When a woman saying that is obviously heated up I'll pop off with "that's ok, some girls get really turned on by long soft hair slowly brushing their legs". I rarely make sexual comments, but that one is more than ok because she'll get an image in her head and it's perfectly true. If she smiles and/or is flustered in some way it's 100% Game On and we're going to bump uglies! If not, that's ok too, I'll immediately switch to another subject.
Another note: My extremely strong reality is that I'm a displaced caveman who doesn't buy into a spectator world and consumerist view. I take what I want, I don't care what people think, and I'm a rebel against what men are expected to act like (tv, movie mushy crap). So, I can kino all I want because a) I'm seen as Alpha: take what I want when I want it without fear, and b) girls will automatically assume I'll be the type to throw her down on a bed without weak "can I put my arm here" or "do you like when I do this?" bullshait. And, a note on the note, Golddiggers and Professional Dates avoid long haired guys like the plague, they're looking for Bank Managers and other executive types, not a caveman type they'll get hooked on. If a girl is flashing IOIs to a confident clean-long-hair guy, it's not about money, it's primal. I have enough money to live comfortably, but I do not mention, display, or spend it on random women.
A confident man with good long hair will completely blow the doors off of flashy, wealthy, situationally confident/powerful, or muscular men while wearing less than a few hundreds of dollars of clothes and inexpensive accessories.