Evolution history of "夫" might help us to know its meaning and the logic behind. (image get from http://www.vividict.com )
|Learn one Chinese Character a day - 夫|
When a young man grows up, he will have to start tie-ing up his long hair. Below is a typical image of having hair tied up with a hairpin in ancient China.
|Tie up hair with hairpin|
Now let us enjoy a Chinese calligraphy with "夫" inside: