It is definitely not fair because everyone should be treated equally and rules should not be distributed on the basis of gender or sex.
Not only about the girls but also for the boys. Everyone is equal in society and should be treated so, everyone should have the same rules for everything that is been followed in the society.
Boys should have the privilege to follow the same rules as the girls too and the same should be for the girls as well that they should also get the opportunity equal to the boys.
A discrimination based society is not good and someday or the other such type of society, either has to undergo serious changes in order to treat everyone equally or such society will meet its end.