Even my guy friends who you wouldn't expect to have looked at it still had some traces on their computer.
Now, there might be guys who go months or years without looking at it, maybe they have a very good sex life and don't feel that it is needed.
How many guys are really opposed to it, I have one friend that I really, really doubt would watch it. He is really religious and with a conservative wife and two kids. But, I could always be surprised. One of my wild friends was surprised at what sites I told him about when he showed me some sites he thought were good. He would have never thought I would have been the type to look at it.