If a girl has last minute resistance to sex, you can try to keep on heating things up a while first.
If you cannot without words make her comfortable with having sex with you, then words can easily change the situation.
Just reason with her, asking why she's scared or such and once you've addressed her concerns and she runs out of logical reasons, she will be more comfortable
and in general be alright with having sex, even if she's very inexperienced.
Typical concerns:
A) "You will leave me after sex." My response: Promise to see her again and such.
B) "I have a boyfriend." My response: Just say something like no one will ever find out. And if necessary, add something like: It doesn't make any difference whether we go all the way or not, you don't need to feel bad. It's not your fault it's my fault.
C) "I would be too easy", or "it's too fast.". My response: It's my fault we are doing this, not yours, and you're not easy. It's normal when a man and a girl are in the same room that they have sex.
D) "I don't want." It's almost never true (unless she's on her period). Girls like sex. The real reason is something else.
E) "I'm scared". Usually because of very little experience. Anyway, just keep plowing through but take it a bit easier.
Sometimes I outright have to show my frustration at their concerns and ask like: Do you want to see me again? If she says yes, then I say something like I'm bored with virgins and girls who are not sexual.
I'm not gonna date you for months before sex, I'm a sexual guy.
3 times out of the last 3 times on a first meetup I have had to resort to this and it worked, after I've addressed their concerns and they still are not letting me take off their pants..
After having dealt with so many last minute resistance situations, I'm quite sure bedding 80 - 90% of 18 - 32 year old thai girls on the first time you meet them is all about plowing through socially conditioned resistance to the idea, at least if you're a decent looking confident guy.
Just about creating enough comfort for it to happen. Enough attraction happens fast and the girl doesn't really have to know you. The remaining 10 - 20% are girls who are quite westernized and are to be treated more like white girls. Not saying there's much difference between the two as far as last minute resistance goes. But often more attraction is needed or the attraction is not all that automatic.
Recently I've had 2 first meetings after getting that girl's phone number per day with 2 different girls pretty often, and at least one of them ends up in sex, often both.
I would not be able to do it if the girls were regulars.. meeting 2 regulars every day would be exhausting but new girls = interesting.
I still get frustrated with some of the more confident, party girls' games sometimes. I seem to get a bit obsessed about getting a girl who is being difficult sometimes as it's not too common anymore.
Getting obsessed is obviously bad for your feelings and your game.