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I know I can't speak for everyone, but I've noticed that hitting the weights hardcore seems to have boosted my drive to a whole new level (all hail testosterone, lol). This can be a very empowering thing, or it can drive you crazy. I tend to get frisky when I'm stressed, so perhaps you can evalute the other areas of your life to see where it's really coming from.
This is all perfectly normal.
If you gas, its gunna happen and since you dont, the increase is do the the increases in endogenus Testosterone that your body is making due to the bodybuilding thing.
Dont fight it, enjoy, some people have just the opposite problem, mike