accordin to my fren who is a heavy drinker, yea it is true. a shower is ok but only with warm water.

Alcohol depresses the functioning of the body's cells and organs, making them less efficient. Alcohol's effect on the brain is dangerous, as the brain is responsible for coordinating critical body functions such as the senses, perception, speech, and judgment. (6) Socially, drinking is dangerous in that emotions are more freely expressed when one is intoxicated. This is because the part of the brain that allows us to control our actions and behavior is relaxed. There is a loss of self-restraint.

When intoxicated, it is common to feel warm. This is because alcohol acts as a vasodilator, dilating surface blood vessels. However, the feeling of warmth is misleading, because the expanded blood vessels actually cause you to lose body heat. (1)

At different levels of intoxication, alcohol has different effects. Many drink alcohol to enjoy the relaxed, euphoric sensation. However, at higher levels of intoxication, the stimulating effects of alcohol begin to fade. At high levels, alcohol is an anesthetic that acts as a depressant on the central nervous system. Alcohol can decrease heart rate, and lower blood pressure and respiration rate to dangerous levels. When this begins, the drinker begins to feel tired. If enough alcohol is consumed, the drinker will fall asleep, or in extreme cases, the drinker may lapse into a coma.

I'd be more worried about the heavy drinker falling in the bathroom more than health effects from bathing while drunk.