Ok, no replies so I'll give this a shot...
So I always feel this one is a touchy subject. Inexperienced guys misinterpret what LMR is and it's pretty much what gives PUA a REALLY bad name.
From my perspective, there is such a thing as "No means No". What I mean by that is that there ARE instances where a girl is just not in the frame to sleep with you and you need to read the signs of disinterest and not ignore this and push forward where she is uncomfortable.
Ok, so getting that disclaimer out of the way,
A lot of seduction comes down to body language and sub-communications. If you're "not sure" she wants to sleep with you then there's a good chance she doesn't (yet). However, even when all the body language, her tone, her actions, the way she's looking at you, touching you, etc, all send the sign that she is ready to go to bed with you, you'll quite often still get resistance in her words.
Look, the reasons are many and varied and there is a lot of material out there as to why girls will do this, but basically they need to rationalize to themselves that this is the right thing to do.
Whenever I've been faced with this it's a little counter-intuitive how I dealt with it. Logically if she says something like "Oh we shouldn't be going this.." or "I'm not that type of girl...", a mans natural reaction is to begin to try to talk her into it. What I've found is that the more you talk and try to convince her, the more she is infact lingering over the reasons why NOT to sleep with you.
It's like that old adage of the pink elephant in the corner... keep telling her over and over to not imagine a giant pink elephant in the corner of the room and guess what she won't be able to stop thinking about!!
So instead what you want to do is not try to rationalize it to her, but instead just acknowledge it and move the conversation on. Don't let her linger on the thought.
If she DOES want to sleep with you then just keep things going as they were and be in control of the situation. You need to be a strong man and a leader. She's waiting for you to kiss her, touch her, etc and then she stops rationalizing it and begins to be in the moment.
If she DOES NOT want to sleep with you then even this tactic will not stop her from over-thinking it. In this case she's not ready and you're not at that point yet. It's not quite LMR then, you've actually moved too quickly and jumped passed some stages of the interaction that would build up to sleeping with her.