im 18
i'm against porn if you are in a relationship and using it to get off, because its pretty much cheating when you are invisioning yourself having sexual relations with someone other than your gf/bf.
if you're using it to laugh, because its absolutely hilarious if you have the kind of mind set i do, then its fine.
premarital sex, i am fine with, because some people never get married. its everyones own opinion, really. if you love someone, why not express it to them?