There is a big list of gay artists. Somehow being gay and being a painter is so connected and correlated that many of the great men like Da Vinci, Michael Angelo and Caravaggio give a rich legacy to gay men all around the world. Here are some of the paintings by the masters and contemporary artists with a gay theme or male nudity for that matter!!
Joseph Christian Leyendecker - Commerical Gay American art.
Richard Bruce Nugent - The explicit African American gay art pioneer
Charles Demuth, Distinguished Air, 1930.
Leonardo Da Vinci - the master of all times
José Manuel Hortelano-Pi - earthy humans
Ralph Chubb - Contemplation, 1925
Claudio Bravo - hyperrealism
David Hockney - not so straight world