BigKugels
Historic photography of the nude
Gbltq
Huge reference guide with plenty of interesting articles about gay culture.
Leslie Lohman Gay Art Foundation
New York foundation working for the preservation of gay and homoerotic art.
The Homoerotic Art Museum
Nice and very rich site with gay art from across the world.
The World History of Male Love
Interesting site of homoerotic and gay art throught the ages.
Gayeros Magazin
A large and exciting source of both new and classic homoerotic art. It's a polish site - but the images are quite international!
Gaypaintings
Home page and gallery of artist Raphael Perez. Rich site with many links to other art and homoerotic gay sites and artists.
Tom of Finland Foundation
In addition to drawings by the very well known Tom of Finland, this site has galleries of lots of other accomplished artists as well.
Read my blog:
The Gay Art Blog
The Gay Art Blog is a weekly review of gay art and gay artists on the internet, including a news section on real-world gay themed art exhibitions.