Is it bad if me and my sister go on porn sites?

Well im 16, and my sister is 14 the thing is that me and my sister have been on porn sites at a younger age like I started going on porn sites from 14-15 years old and my sister going on at 13 years old but most porn sites say that you have to be 18 and i fake my age and just say im 18 so i can enter the site im worried that is it illegal or will they ever somehow find out im under 18 lol??, because my parents would kill me if they found out If i was watching porn :S or if they ever somehow get a letter aout porn

 

dont worry about the under 18 thing. i think just about everyone under 18 fakes that.