K.T., thank you much for the information!

The works of Joe Phillips are usually easy to recognize, but this particular picture was a puzzle for me. Well, then we should usk Joe for a licence.
The other suggestions sound nice as well, here the pics I have found on these people:

Karl Heinrich Ulrichs;

Harvey Milk

Fanny Ann Eddy;

Pierre Seel

Harry Hay;

Larry Kramer

Oscar Wilde;

Lytton Strachey

E. M. Forster;

Yukio Mishima

Edmund White;

Rainer Werner Fassbinder

Pierre Paolo Pasolini

Dag Hammarskjöld;

John Maynard Keynes
The last 2 gentlemen were not openly gay, I suppose? I have found some indices that Mr. Keynes was homosexual in his youth, but no further informations for Mr. Hammarskjöld. Can you help me out with a link? Thanks a lot!