If you loved Lovelace, try The Celluloid Closet
A bridge between a film you've already seen and one most people haven't. The Celluloid Closet has roughly 6.6× fewer votes than Lovelace — it's a deeper cut, not a mainstream recommendation. Here's what they share, and what the second one does that the first one doesn't.
What they share
Both films are directed by Jeffrey Friedman, Rob Epstein. If that's the register that drew you to Lovelace, the second film will land in a comparable space — through a different lens.
What The Celluloid Closet is
Psycho meets sociology. The film explores gay representation in cinema. It delivers a century of celluloid history.

