It honestly depends on the girl and also, at least for me personally, it depends on the person who is the object of affection.
I've never dated in a traditional sense but I have had relationships and am currently a married woman, so I'm not sure how much my perspective will help. This is based on my personal experience so YMMV.
When it comes to guys I tend to be straight forward in my feelings if I'm attracted to them, and equally straightforward if I'm not. When it comes to girls I become a blushing idiot, very shy, and tend to stammer a lot and make a fool of myself.
For both:
I believe I do tend to stare like the above posts say. I also like to make food for them and give small tokens of affection. I also want to see them every chance I get. Sitting in comfortable silence is always a great time for me.
I tend to move at a relaxed pace and make sure we're on the same page before moving forward in a relationship. Open communication is the most successful policy.
I'm not personally a touchy-feely person so I never touch folks without explicit permission, so that doesn't fit with some of the previous posts. But that just may be me being awkward. I also have issues with like, implied social stuff. Much like a vampire you have to explicitly invite me into a home. But if you want me to sit on your bed (something that was common with some platonic lady friends who didn't have chairs in their rooms) I can't bring myself to do so because it feels like an invasion of privacy.
In some societies inviting people of the opposite sex into your room (or even house) is considered inappropriate, but it also depends on the person. I've hung out in a lot of guy friend's rooms to play games and it was never a big deal. Then other friends' would have parents who would flip out at the thought of it (though those tend to be the parents who already remove the doors from their kid's rooms...) There have also been friends and partners alike whose rooms I'd never seen because I only hung out with them outside of the house or in their living room. It all depends on people/age/expectations.
For stuff like laughing at jokes...I am not sure if that's a good metric. Yes my spouse and I laugh ourselves silly, but that's different from say, polite laughter. Some societies pressure women to be compliant and submissive so many will laugh at jokes even if they're not funny to avoid making an uncomfortable situation or making men angry. It's sadly common. Because I was resistant to this sort of engendered socialization, if I think a joke sucks I won't laugh. If I think a joke is offensive or don't get it, I'll question it. Weaker men feel threatened by this and try to use insults and occasionally physical intimidation to regain a sense of superiority. Fellas who are more comfortable in themselves don't even seem phased by it or even agree.
CW for slut shaming, rape, violence:
I've had people misunderstand my general platonic friendliness as romantic interest when I was just being pleasant and thought we were friendly. Usually the situation becomes apparent to the person misunderstanding and we can peacefully talk it out, but sometimes it doesn't.
Someone I had considered a friend once completely blew up at me because I didn't want to go to the movies with him. I'd explained that I'd just been hospitalized and figured I wasn't good company. He took this to be be me not reciprocating his feelings, when I had no idea he had interest in me and had never asked me on a date. We'd talked about going to the movies a couple times in groups (with our theater coworkers) but there tended to be scheduling conflicts. He was convinced I was stringing him along emotionally. I tried to calmly talk to him but he started to raise his voice before eventually screaming about what a "slut" I was in an attempt to publicly shame me. The other theater crew were baffled because no one else had realized he was trying to ask me on dates either. (Because, to our knowledge, he never actually asked.) I was only at the theater that day to let the crew know I wasn't well enough to participate in the performance and to use the understudy. And if he hadn't blown up at me and actually asked me out at another time, I may have considered trying out a couple of dates even though I wasn't initially attracted to him. It was especially odious because of the reason I'd been hospitalized: I'd been raped and he had to make it about him.
He thought if he put in enough niceness "coins" that I was a gachapon from which sex would fall out. It's been about 10 years but it still stings, it was such a disappointment. I'd considered us fairly good friends (though not particularly close) and was sad to see him turn out totally different from who I thought he was. Honestly, I dodged a bullet. Back then we didn't have the word incel but he completely fit the bill and it wouldn't surprise me if he did a mass shooting like that guy in March.
