As HelloSonny said. If you go to a love hotel then she should be DTF already.
If you mention love hotel (and the woman who would teach you Japanese) you must be in Japan. So two things. Japanese people are famous for ellipses. Instead of being direct, use indirect approaches to make her understand that you want to take her to a love hotel (in the line of "you look a bit tired, let's find a place to rest for a bit, I'll give you a massage"). Another way is just to take her hand and walk her to a place full of love hotels (Japan usually have these streets lined up with them), and if she's not stupid she should understand what's your intent. From then you can gauge her reaction and proceed or not.
That being said, a fair amount of women have a huge prejudice against love hotels, slut-censoring themselves not to go there ever. With these there's nothing you can do...
Well, of course I escalate from the beginning. How else did I get the opportunity to make out with this Japanese women before taking her to a love hotel?
I just mean that even if a woman is dtf, they will still often give LMR due to things like slut-censoring, etc.
You advice is actually really good. Yes, I have been living in Japan a while and I'm very familiar with the culture and language. I will try to be more subtle and try out these less direct approaches with some other women I know. I'm currently dating 4 different women but only of them is a full on sex friend now. I still plan to escalate with these others in the near future.