Tip I learned for my sister:
If you don't want rumors of yourself going around how you are doing the dirty with another boy--- don't give any boy the time of day. You can be friends, but it'll still land you in a bit of trouble, but not much.
Just walk away from any of the boys who flirt with you... Walk away... and if you don't know what it means, don't ask questions. Roll your eyes, signal you don't care, and walk away.
Be careful and smart, laugh at them and see what people come up with. Someone said my sister was addicted to drugs and alcohol, she hasn't even had a boyfriend yet.