I can attest to this, being an 18 year old. When I was 12 and first discovered porn, the site of a half a nip slip would get me off for weeks imagining what the rest of the glorious nipple looked like.
Now I can't get off unless I'm looking at some bitch take a shit in a blender and blending it with a guys sperm and then pouring it over a dog fucking her sister. Fucking internet.