You don't seem to have any data putting your figures into any context over time: run the same study in the 80s and I would wager you'd see similar even worse results. Wank mags and grainy VHS were passed around schools from the moment they appeared, including BDSM and torture porn - often in the form of sleazy B-movies. Sure, pornography is far easier to access today. But the material is the same, and this notion that somehow, today's boys and young men are worse for this exposure than their predecessors is insidious and deeply ignorant.
It is significantly more difficult to find young men today who think it's acceptable for husbands to beat their wives - or that rape is never rape in marriage. Or who think they can get a woman drunk to seduce her. Campaigners had to work damn hard to raise public consciousness out of the traditionalist inertia around these blights. Frankly, to anyone like me, old enough to compare several different eras and their male representatives, comments like yours and the inferences you'd have people draw from them, are utterly ridiculous - and yes, hugely unjust to the overwhelming majority of young men who flinch from the idea of hurting a woman in bed or out of it, regardless of what type of pornography they've been exposed to.