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alcohol doesn't make you do things you don't want to do. i've been hosed on all sorts of substances and i've never cheated on anybody, because i'm not the kind of guy that cheats on somebody.

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Way to make a sweeping generalization based on one data point.

Many guys have natural urges to cheat on chicks. When you're sober, restraint is relatively easy. When you're drunk, it's not. I can tell you from personal experience that every time I've cheated on a chick I've been drunk.

I'm not saying that drunkeness should be an excuse to cheat, but saying it isn't a factor is plain stupid.