Bruce of Los Angeles took these images of Mike Norlan, who likely modeled in the early 1960's, when the laws were changing in America to legalize images of adult nudes.
I believe most of these images of Robert Kendall appear in Kensington Road, a publication put out by Bruce of Los Angeles after the legalization in America of frontal nude images of adults.
If you follow this blog or already know a bit about beefcake photography, then you know many of the photographers took nude images of their adult models and kept them out of sight until they became legal in the United States.