Skin is in for spring...for the men, too, in the form of male cleavage, or "heavage." The Wall Street Journal has charted guys' ever-plunging necklines from Douglas Fairbanks Sr. in 1920s' films to disco dancing John Travolta to the Spring/Summer 2010 menswear runways. But with heavage comes great cosmetic responsibility: no one wants to see pale, flabby man-decollatage. Apparently, a thin patch of chest hair has become acceptable and even desirable these days. But what do you think? Take a look at our gallery below and tell us whose heavage is hot...and who needs to put it away.