As far as 7s in romance go, I briefly dated an ESFP 7w6 (not sure on instincts, but maybe sp/sx too). Good guy, no hard feelings, but I found him very draining. He required too much attention.
I liked him immediately though because he is very warm, personable and easy to talk to. He seems to find anything you say fascinating and is happy to talk about anything (to the point of tiring me). He certainly seems happy & upbeat, but is prone to irritation or frustration over some minor things. It passes quickly, but it's a trend I notice with 7s to not cope well. He also could be flaky & irresponsible. I felt like I had to play the "J", which I resented.
My ESFP sister is 7w6 also (so/sp I think, not really sure) and was quite the drama queen / attention-whore growing up. She's also very generous and loves to buy people gifts and basically lives to entertain in social situations (not like a professional performer). Growing up she didn't understand me much & would attack my personality a lot, basically telling me I was an "ugly person" & that people didn't like me, which was not true and which she has admitted to as an adult. There was a bullying streak in her to push to get what she wanted in a way that she seemed to think was justified, like it was for some greater good (7 ideals in a Se-dom I guess).
She has a LOT of interests, ranging from sports to poetry to cooking to writing - she's not one-dimensional as people make Se-dom out to be, but pretty typically 7 in this way. Like my ex, she has at least a surface interest in most things, making her easy to talk to, probably why people like her almost instantly.
She can seem deceptively positive. She actually gets depressed easily and has very few coping skills with anxiety. She will have an extreme impatience to get out of a mood or situation that is uncomfortable in anyway, which is some of where the hedonism comes from. Her level of impatience can make her hard to take at times; it's interesting how she has trouble seeing herself this way. It's like she thinks everyone else is bringing her down, but she is making everyone else miserable.
If she has no plans for some fun in the near future, then she gets frustrated. She's always planning weekend getaways, trips for the next summer, what to eat tomorrow night, etc. She has to have experiences to look forward to, or it's like she gets anxious. She blows through money like water. I tend to shake my head at how little foresight she has for practical things (and I'm an INFP 4!), but how much detailed planning she can put into a party or pleasure vacation.
We've always gotten along somewhat, but she had a bossy streak that would clash with my quiet stubbornness. With other people, she can get obnoxiously opinionated at times. I tend to get fed up with her short-sighted pleasure-seeking and she with my navel-gazing (often sees my analytical side as "hostile"). She likes to play "dumb blond" to manipulate people, which annoys me, and she accuses me of being a self-righteous martyr.
Some of this is our Jungian types clashing too of course. But we mostly get along, both being pretty easy-going and liberal in our tastes (not really attaching moral judgements to aesthetic experiences the way, say, my iSFJ e6 mom will). IDK if we'd be friends if not family, but given that I usually click with them, probably, once initial bias wore off on her end. With her various illnesses, she is more understanding towards others now who are not 24/7 upbeat partiers.
Ne-dom 7 is probably quite different. Not sure if my childhood best friend was ENFP 7w6, but likely. She adored me at first, then grew annoyed with how "anti-social" (aka unsociable) I was. I also was too much a voice of morality, even if in action more than words. She didn't want to be bothered with consciences.
Generally, I like 7s off the bat and they seem inclined to like me. We often both like art and novelty and some indulgence in luxury and experience, so they're fun to hang out with. For romance, I might find them too overwhelming in the long run. I can't match their energy and perhaps I would start to feel like a downer.