Feel free to answer the opposite too - nsfw things you wouldn’t do with a romantic partner, but maybe with a fling!
The big things for me are penetration without a condom, which includes cumming inside me, and sharing naughty pics.
I think I would generaly rather not want a romantic partner to know about my vore kink. I would rather not talk about it unless they happen to have it.
As someone else said, breeding. I would not risk getting pregnant with anyone I wasn’t in a stable relationship with.
To be absolutely honest, I guess it’s an unpopular take but in a perfect world I would not have minded a grab bag kid, not knowing who the dad was wouldn’t have bothered me, I know who the mom is, and I have and like having kids, but we don’t live in that world.
I think other than that I have nothing I haven’t done with casual partners, that I have done with my two long term guys. And nothing that I’ve done with casual guys, that I wouldn’t do with the long term guys.
What’s a “grab bag kid”? Like a kid who was born to a mother who used a sperm donation?
Just mean if I didn’t know who fathered my kids, I personally wouldn’t have cared. I didn’t want kids as a secondary result of a romantic relationship, never really wanted to give some guy a kid, just wanted to raise some.
We don’t live in a world where that works though, kids like to know who their parents are, both of them. And as it turns out I don’t mind keeping a man around, either.
I’m pretty much aromantic, so there is no difference to me. Sex is just a fun activity and has no bearing on my feelings toward anyone (or vice versa). I am also willing to try anything once.
I’m not quite aromantic but I’m pretty much the same with kink. Do I trust someone enough to do this or that to me? Then you may as well do all of it. I can’t get pregnant anyways.
Making out. I didn’t even really like it when I was partnered.
Sex is very disconnected from intimacy. I’m not aromantic but sex is not romantic. Sex is me being degraded and used. I submit as an object, the romance might be being cuddled and praised afterwards.