Most Helpful Guy
A lot of guys really like long hair. I'm not personally one of them, but I'd so I'm more of the exception than the rule. There is no one hair style / length that guys like. Varies form person to person.
Most Helpful Girl
I think a few inches above your butt is the longest it should be. That's how long mine was when I got it cut to my shoulders, and now it's up to my boobs. I want it to be like 4 more inches- I'd keep it at that length for ever. So imo, if it's touching your butt, might be too long.