In the area where I live (SE Asia), when you see a scantily-clad girl dancing in a nightclub or bar, you just have to guess for how much she would do it.

I just tell her: "Look. I find you cute. I'll give you $100 if you come to the hotel with me tonight for an hour or so."

Some girls would do it for less, like $30 or so, when they are older, or don't look as fresh any more.

These girls are not professional prostitutes, but they are certainly not virgins either.

So, they've got nothing to lose. On the contrary, many of these girls are often short of cash. For example, if she needs to get her motorbike fixed, and she has already run through her student allowance for the month, she will be inclined to say yes.

Therefore, why waste time on "game"?

I don't want to spend hours in a row bullshitting to a girl, when I can also get the job done for a few greenbacks.

These girls almost never say no. Only virgins do, but they usually don't hang out in these clubs and bars. Sometimes it happens that the girl wants more than I think that she is worth, but in that case, I tell her that we will do it next time instead, because I did not bring enough cash. At that point, she will usually just ask "So, how much did you bring?"

I don't know how things work in the USA, but in Europe, if the girl is Eastern European or Russian, I know from experience that this approach works like a charm.

Conclusion: In my opinion, you don't need game to get hold of casual sex. You just need money; and not even that much.