regarding some of the recent comments, speaking for myself.
When I enjoy kissing, it is distinctly a sexual experience. when kissing "feels romantic" I dislike it. kissing I would personally not consider inherently romantic, but the most common forms of a couple kissing I see as romantic. The "sexual" kissing I enjoy is really just making out tbh. and it's been years since I was enjoying that kind of kissing in-action - since then my expression of sexual attraction has changed, so I can't tell if I'd be into it still.
regarding romantic feelings -
falling in love is something that I did not realize I was experiencing until I slowly came to admit to myself that I experienced it. but now that I've identified it, in knowing that some people do not experience it, it's obvious to me when I am in-love, and when I am not. it's frustrating when I am not in-love tho because a part of me wants to fall in-love with someone, and this ends up giving me a lot of anxiety.
I would interpret the phrases such as "crazy in love" and "love hurts" to not at all refer to the actual romantic aspect of the experience, but instead, the anxieties that often arise because of it. to me when I am in-love I just... feel.. attracted... to them... I MAY have thoughts about wanting to be with them but really that is not constant. but a strong feeling of vague interest in them is pretty easy to experience just by looking or thinking about them. what drives me crazy is, wanting to DO something about those feelings. it is like a tension which - if I am allowed to enjoy the feelings by interacting romantically with my partner or date, it is a wonderful and good and healthy feeling. but, if I have to contain it to myself, because the person does not appreciate my attraction to them - this is when it hurts, when I suffer, when I have a ton of anxiety, when I become desperate to try to figure out HOW to even interact with them at all without smothering them with romantic interest. And the more I hold my feelings quiet, the more and more this suffering intensifies.
To think back to the people from my past who are in my past, there is suffering there too, a longing for what was to still be, and it hurts. I also get this feeling with lost friends, but with a romantic attraction there is also the feeling which I had to identify as romantic - in fact, it was looking to my past that led me to discover that I felt romantic feelings at all, and then experiencing them again for a friend that made me confirm that I do feel romantic feelings. but, being in love with someone who does not return the feelings, for me is 10x worse than pining for something from the past. in the later, I can clearly see there is nothing I can do to even interact with the person, so there is no compounding of the anxiety - it only stays constant, tho it hurts, it does not intensify. when I am interacting with someone however, and cannot express my love for them, that is when it royally sucks. it is just too much to handle.
I am sorry that I cannot provide any info on what romantic attraction feels like. That is not something which is possible to do. I can only describe what I feel - but those descriptions are, "intense" and "warmth" and "love" and "interest" and none of these things are reserved for romance. I feel all of those things for other things. just, the only thing that helped me to figure it out for my experience, was to compare my feelings for people over and over and over again, slowly being better able to identify the difference, to the point that I was sure there WAS one but not sure WHAT that difference was, until I came to suspect that difference was romantic, until I came to confirm it. And this was only possible because I still feel romantically towards 3 of my 5 crushes. so when I think of them, I feel in the now the romantic feelings. if there were no current feelings to observe, I doubt I could've done that process to any conclusion. and even as it is, I'm still unsure - I was worried I was developing romantic feelings for someone, and couldn't be sure what I was feeling until I saw her and talked to her in-person. that, now that I know what I feel, it is easier for me to say "you just know what it is when you feel it" because that is exactly how I know. I just do. it feels like romantic attraction. it is like touching a dry material blindly and knowing that it is fur and not a carpet, despite the fact that it is thick and course and stiff. you've felt this pelt before and identify the animal exactly, and know it isn't any carpet you've felt. It feels unique to our brain, our brain has learned to identify that it is different. but the reality is, I had to learn to identify it at all.
oh also, I don't get the whole "merging" or "as one" thing a lot of people get. I do agree that it tends to be a common romantic message, but I don't believe it's a universal sentiment for all romantics, since well, I don't share it.
tho I do want to be close with the person and spend a lot of time with them, but well, this is not reserved for my romantic feelings. I guess it tends to be more intense with romantic feelings.
also - personally, I do in fact believe that romantic feelings are better and superior to platonic ones. I am sorry that this is my oppinion about my feelings. I would think it's weird however, to make some claim that this is true for all people, especially knowing about aromantic. necessarily, since an aromantic does not feel romantic feelings, romantic feelings are in fact less than platonic ones - I mean after all, they are zero. hehe.
last regarding the bed - I would not claim that sharing a bed is necssarily romantic, but bed-sharing certainly brings romantic anxiety to me - I do not like sharing a bed unless it is literally my partner. I could under some circumstances do it however - especially if there is a lot more people than appropriate sleeping surfaces. I do not believe I'd find sharing a room to be romantic however. there are some ways to share a room romantically of course but without explicitly attempting to make it romantic, two people sharing a room is just a pair of roomates. it's nonromantic by my impression of it.