Okay, lets go through this very simple logic.
Lets say that you are a boy who is 17 years and 364 days old.
You see a girl who is 17 years and 363 days old.
Its okay if you feel attraction to her because you are both under 18.
However, the next day you turn 18, but she is 17 years and 364 days old.
If you are attracted to her then, then you are a pedophile.
However, after a few days she turns 18 and then its again okay to be attracted to her.
Now, lets say that you are a 15 year old boy.
You see a girl who is also 15.
You are of same age, so attraction is okay.
However, 3 years later, if you still get attracted to 15 year old girls, then you are a pedophile.
So basically, the question of if its okay to be attracted to a 17 year old girl depends on your age.
If you are also 17, its okay.
If you are over 18, you are a pedophile.
If you are 11, she is a pedophile.
Lets say that you are 17 and you kiss a girl who is 17.
Nothing illegal there.
But lets say that you are 18 and you kiss a girl who is 17. Thats a horrible crime and you are an abuser.
Lets say that 17 year old girl kisses an 11 year old boy. Now she is the abuser.
Lets say that an 11 year old boy kisses a 7 year old girl. Now he is the abuser.
So to be safe, always date a girl who is exactly the same age as you and when both over 18.
Why?
Well, lets say you are 19 and your girlfriend is 18.
How can you prove that you werent attracted to her when she was 17 and you were 18?