ALEXANDER JENSEN YOW (b. 1925), was a painter, a model for George Platt Lynes and Paul Cadmus and, later (1950s-70s), a conservator at the Morgan Library in New York. He was, for a time, the lover of Lincoln Kirstein who, although married to the sister of Paul Cadmus for 50 years, liked guys enough to have both long-term affairs (as with Jensen Yow) and plenty of casual encounters with students, sailors, street boys and men he met in the showers at the 63rd Street YMCA.
George Platt Lynes took the following photographs of Jensen Yow--the first in 1948, the next two in 1950:
http://www.elisarolle.com/romance/images/Jensen_Yow_1948.jpg