@Woyzeck Interesting. It's not a culture where circumcision is commonplace. Perhaps he was cut due to phimosis, and he represents men in his liking?
@Pecan_nutjob Maybe the man is not circumcised, but has retracted his foreskin as an invitation to have sex with him, instead of an erection.
Or the artist didn't want to represent an ideal man, but rather one with imperfections, like his big thighs which give him an androgynous appearance. Was circumcision one of these imperfections?
You talk about the origin of the artist, I give another example from the same exhibition with an American man in the 1980s (Dix and the Present, Deichtorhallen Hamburg):
Han Goldin
Bobby masturbating, New York City
https://drive.google.com/file/d/1-1uGzMDldd9iZI_oRKa0ZAa1rkjJxc6w/view?usp=sharing
Another photo of the Kunsthalle in Hamburg, I didn't note the name of the artist:
https://drive.google.com/file/d/1-6WjNpegZqm5lZxB4ABM2NnJ68SsJelv/view?usp=sharing