Biology. If someone has a high T at a young age he can get girls to notice.
@Doomsday spend time at a job (if you have one) in a section where you're usually around women, I'm friends with half of mine on my staff and
you can learn a lot by not intervening (hearing how they interact with each other), It's like doing reconnaissance on women, I been at my job for more than a year and the
amount of shyt I've learned just casually picking up their conversations, indirectly.
Knowing what makes them laugh works wonders too, figuring out how their personalities work, playfully making fun of their weaknesses/insecurities, you'd be surprised.
The other day, I overheard that one of the girls (White redhead) hates (is scared) of dudes who whispered in her ear without her knowing (one of our older cooks is a basically a "Cobweb perv" which prompted her aversion to that). So today, I had to restock the storage room area and before taking out the trash, she asked for my help in there for a few minutes later on.
When I saw that she was by herself, I had a bright idea

to scare the shyt out of her with the whisper thing, when I came back from the trash dump area. I peeked to make sure she didn't see me,

when she wasn't looking I straight up rushed to her ear, like:
("Did you still need my HELP!?")
Had her dying laughing for 5 straight minutes, just small shyt like that goes a long way bro. It's not "game" it's simply communication skills and some psychology like you said earlier.
I work with the women there who are of various races, and knowing how their humor works differently, makes it that more enjoyable. Here's 2 examples:
A Black chick from there I know is from Compton, so our banter is always on some CA hood shyt, trying to outsmart the other with slang. One of the Mexican girls I'm cool with, is a Hip-Hop Head.
We joke around about whatever is trending, rap our favorite songs and express things both of us like/dislike about certain rappers.
Whatever you do, don't ever use one-liners, you're not a rapper (even so, that would make it worse if you were one). Personally, idk why guys stress the intimacy part so hard,
like try being a fukking person to them first, lmfao.......all that other shyt comes later anyways.