Hardcore pornvideo, using it at least twice while masturbating, not turned off by the fact Max is an old man."
2.Something that just interest you or makes you happy.
Not just a sexual term. Anyone from the 60's used this term prevalently through out the grooviest time in our recent history.
Timothy Leary "Turn on, Tune in, drop out."
ex2:I just got Turned on by this guy to Jefferson Airplanes album.