Teach them how to fact-check, and above all that anyone can put amything on the Internet - it doesn't matter whether it is real or true.
Teach them that porn is entertainment. It's not real, any more than action movies.
Sex or not sex are both normal. Liking porn is fine, as finding it boring and pointless. Same with action movies or romantic comedies.
Then they will be orders of magnitude better prepared for the real world than any politician you may find in Westminster.