Looks like it's this article:
http://www.heraldsun.com.au/news/breaking-news/one-in-three-women-seven-in-10-men-watch-online-porn-study/story-e6frf7jx-1225828803198
It actually says:
So ~15 hours a day is only a small problem? And would 5 hours a day be fine :confused: I think reading...