When adapting the 2019 LGBTQ romantic novel Red, White & Royal Blue for the screen, Matthew Lopez was careful to circumvent an R-rating. The film has a handful of sex scenes that stop short of full-frontal nudity — there’s some bare butts and, naturally, shirtless men.
But it wasn’t enough. Red, White & Royal Blue was rated R, meaning people under 17 would need to be accompanied by a parent or guardian to see it.
Another recent film with LGBTQ leads, the French romantic drama Passages, received an even harsher NC-17 rating, which would restrict people under 18 from seeing the film at all, and also keep it from playing in certain theatres.
The ratings do disclose why they got that rating. It’s a bit basic, just says things like nudity, or sexuality, but it gives you an idea:
https://www.filmratings.com/Search?filmTitle=oppenheimer&x=0&y=0