I'm sure everyone has looked at pornography before. If you say you haven't then you are a liar, which is just as bad. The problem with it is that it's an unnatural way for the jews to exploit our basic hardwiring as men. As a straight man, there is no way that you could be sent a picture of a naked woman and not at least have a look at it. It's just what our eyes do! It would be a bit of a problem if you found yourself whacking one off though! Haha
The important thing is that we try to minimise the amount of smut we are exposed to, and sometimes it is hard to avoid seeing it because it's everywhere throughout mass-media, TV, internet-land especially, but as long as you're not actively seeking it then it can't do any harm. It's in the intent - if you're actively seeking smut then it's likely to affect you negatively, but if you happen to stumble across a pair of breasts in a picture, what's gonna happen? Nothing, you'll just go to yourself "Oh well, nice rack there!", and move on.... no big deal, right.
It's much akin to if you walk into a bar and a song by Jewish band KISS is playing, or Bob Marley's on or something.... Your ears aren't going to malfunction and fall off just because you heard unholy soundbytes! Sometimes crossing paths with undesirable situations is unpreventable.... Oh well, such is life these days.