Narcos on Netflix. Lots of sex but limited romance. Mostly to make the bad guy appear human at times while he kills people. See, he’s a family man at heart. But he has many girls that he calls friends.
Hard to avoid romance; it generally gets shoehorned in regardless.
Netflix has some David Attenborough documentaries (Life in Color, a Life on this Planet), and he’s one of my favorite humans…
The IT Crowd is on Netflix; Not much for actual romance, but a few episodes will briefly touch on the absolute failure-to-launch for our erstwhile protagonists.
One-Punch Man, if you like mindlessly awesome anime (on Netflix).
100 Foot Wave Documentary series about big-wave surfers. If you ever saw and liked “Step Into Liquid” (also recommended) you’ll be into this.
If you like reality competitions, the kind where they make stuff, not the kind where they play games and are bitchy, HBO has The Great Pottery Showdown, All That Glitters, and Full Bloom. They’re either British shows or in the style of British shows like “The Great British Baking Show.” The second two I wasn’t that into myself, but the pottery one was very interesting. I liked the variety of things they made and just watching the process. Blown Away is another one like them that is on Netflix (glassblowing).
Maybe you’ve seen them already, they’ve been out a long time, but The Toys That Made Us and The Movies That Made Us are fun, very lightweight nostalgia fests for people that are currently about 40-and up. Even if the subject wasn’t in “your” exact era, they’re still pretty interesting.
“Real Sports” is, I believe, the best on-going chronicle of what goes on in sports and the lives of athletes that has ever been made. It is a “behind the scenes” look at the often very harsh reality of big money sports.
If you like nature documentaries, try “My Octopus Teacher” on Netflix. Also there was a documentary series called “Dogs” that I watched a couple years ago that was pretty good.
It seems to me that Supernatural fits all of your requirements. The brothers at the heart of the series spend vanishingly little screen time in committed relationships over the course of 15 seasons, much less married to anyone. One of them has a girlfriend who is offed almost immediately. Each brother basically gets one girlfriend after that, and neither one hangs around for so much as a full season. And they’re rarely lonely. They always have each other, except for when one of them is dead, and that generally doesn’t stick, either. It’s pretty much just 300-plus episodes of hunting weird things and killing them.