The only three I can think of are the two BBC British shows Marcella and Luther. In all both of these, the main characters have BM/WW relationships and sex scenes. Here is a scene from Marcella. https://www.aznude.com/view/movie/m/marcella.html?jwsource=cl
I KNEW I seen her somewhere before. That's Hannah Waddingham who played Septa Unella on Game Of Thrones. Sorry if I brought up any bad memories. lol. As far this show go I heard about it a lot, but have not seen anything on these two characters and their blooming relationship.
What do you mean by "I think it would've worked if Grover was a main character"? Grover is already: 1. part of the regular cast 2. part of the lead character's inner circle of close friends. 3. The main love interest for the lead character So Grover was plenty established as a main character from episode 1 on. Did you mean you think Grover should've been elevated from regular supporting cast to co-lead?
Not 100% but the second season of "Emily in Paris" drops in December and looks like Lucien Laviscount may be one of Lilly Collins love interests:
Love Life Season 2 | Official Teaser | HBO Max William Jackson Harper as Marcus Watkins, a man who re-enters the dating scene following the end of a years-long relationship with Maya Kazan's Emily. Maya Kazan Marcus Watkins' ex-wife Leslie Bibb as Becca Evans, a divorced mother with whom Marcus embarks on a sexual relationship https://www.looper.com/591055/love-life-season-2-release-date-cast-and-plot-what-we-know-so-far/