Do guys always have to approach the girl first, or will girls approach a guy if he is attractive enough?

Each person will do what they want once they get passed their FEARS.

Sex, Age, Grade, Money, Religion, Race won't matter.

Life is happening and you are AGING as the seconds pass.

NOT always but it's better for the guy to approach a girl first. You'll know what I mean when a girl approached you first.

Its typical for guys to do the approaching, but not exclusively so; preferably, its a mutual attraction that is expressed by both persons anyway.

Girls that have some character will approach, and they'll be rewarded one thousand fold!

if he is attractive enough and they are horny enough.

They might. But more likely she'll try to create an opportunity for him to approach.