Here's what he's hiding from you: there are facts even honest dudes hate to reveal. Cosmo thought you should know.(MAN MANUAL: his point of view)

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* Your man may give you TMI about his biological functions, but there are some areas of his life that he keeps under wraps because he's ashamed, shy, or just plain afraid of how you'll react. Here are four of them.

His Friends Are Dogs

You probably suspect that your man turns into a different person around his pals. He knows you think this, so if his friends are a bunch of booze-chugging, skirt-chasing delinquents, he has absolutely no incentive to reveal it to you. "I love my friends despite their faults," says John, 27. "I also love hanging out with them, but that doesn't mean I engage in all their less-than-wholesome behavior." If you trust him to behave--you don't interrogate him about his nights out and avoid bad-mouthing his buddies--he'll trust you enough to explain how Tijuana Tom got his nickname.

He Just Got Chewed Out By His Boss

Few things can completely destroy a man's self-image like poor performance on the job. So when things go south at work, he'll do whatever he can to avoid bringing it up. "I really do like talking to my girlfriend when stuff bothers me, but no matter how lousy I feel about getting reamed at work, it's one thing I never tell her ...