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I have a very different opinion on that one, and I absolutely detest those sites that actively encourage cheating on your partner for a "quick shag with a local".  Granted, porn isn't exactly cheating with another partner, but you're still looking at another girl while you're getting what you get out of it.

Okay, getting a bit off topic, but I did want to make a quick reply to that last statement. One of the things that often confounds me is women's attitude towards men watching porn. Somehow, they seem to regard it as a form of cheating. Actually, they seem to regard ANYTIME a man does something sex-oriented that isn't centered on her as cheating. That even includes masturbation. But, take a look in the drawer of almost any woman who is over the age of 21 and most likely you will find some type of self stimulating toy. In others, a dildo, or vibrator, or a book of some kind (Fifty Shades of Grey).