Thanks to an anonymous comment, I recently discovered British photographer Mike Arlen.
He was a fashion photographer who took up male nude photography in the late 70s after he did a men's swimwear photo shoot and a friend suggested he do nudes. Mr. Arlen passed away in 2022, but left a legacy as perhaps the most prolific British photographer of male nudes ever. He also produced several publications of his own, as below. So enjoy Mike Arlen Day.