There exists many busts and statues of famous Greeks and Romans relating to Christ’s time. And in every case, the men are portrayed with short hair similar to what we find today.
If Jesus really did have long hair, it would be doubtful that Paul (an apostle of Jesus') would have wrote the following:
"Does not nature itself teach YOU that if a man has long hair, it is a dishonor to him; but if a woman has long hair, it is a glory to her? Because her hair is given her instead of a headdress." (1 Cor. 11:14-15)
Paul's comments in 1 Cor. 11:14, 15 concerned women having longer hair than men. The Corinthian congregation was probably composed largely of Greeks and Jews, and among such people it was natural for women to have longer hair than men. Additionally, in Corinth, shaving a woman's head, or clipping her hair very short, was a sign of her being a slave girl or of being in disgrace for having been caught in fornication or adultery. - 1 Cor. 11:6.
But even though today's cultures, standards, personal tastes and local customs vary, the principle still stands that a Christian man would want to wear his hair as reflecting his masculinity and Christian women would want to style their hair with evident femininity so that it will be a glory for them. (1 Pet. 3:3; 1 Tim. 2:9; 1 Cor. 11:15)
Though it is now a personal decision, Christians would want to take into consideration how their personal appearance will affect others. This is so that "in no way are we giving any cause for stumbling, that our ministry might not be found fault with; but in every way we recommend ourselves as God's ministers." (2 Cor. 6:3, 4)
Do You Worry About Your Hair?