I just came across this novel published in 1950:
https://babel.hathitrust.org/cgi/pt?id=uc1.b4097008&seq=7
It's cleared to read for US residents and is about a married, washed up child actor who tries to get back into the business and falls for his younger actor co-star.
It was clearly marketed as being about a homosexual, an extreme rarity in 1950: