Kovert of Hollywood was photographing male nudes almost as early as Bob Mizer of the Athletic Model Guild.
While most early physique photographers required their models to be meticulously groomed and posed them in classical settings, Kovert dispensed with the Roman columns, chest plates, bows and arrows, etc. to photograph his male nudes with their body hair unshaven and in settings that were plain or verging on the unusually theatrical.
Eugene Meyer is one of my favorite beefcake models.
Here are three great photographs of Ricky Alboni by John Barrington, a British photographer who worked with male nudes from 1948 into the 1990's. It was Barrington who built from the ground up the market for beefcake photography in Great Britain.
Ray Liedtke is another of my favorite beefcake models. This photograph was taken by Russ Warner, who in the 1950's was able to photograph many of the most popular beefcake models, including the famous pairing of Jack LaLanne and Jack Thomas.
Pat Milo took these photographs of Kip Behar, who was a popular beefcake model of the 1950's. Bruce of Los Angeles featured Kip in a sprawling spread in Volume 9 of The Male Figure. There's even a great photograph of Kip strolling down Hollywood's Walk of Fame.