I have just started dating a girl that I have a great time with. We laugh, we kiss, she wants to see me all the time and I play it cool making sure I am busy etc etc. we have not slept together which is no big deal after 1 week, but every time I introduce the subject of sex she laughs it off. Ie telling her how I would kiss her all over her body and she will ignore the comment or make a smart ass remark.

I have no problem with this normally and my fear is that I am going to struggle to build sexual interest through my usually tactics and I will fall into the trap of playing out rapport building till she no longer takes having sex with me seriously.

I am not bothered about sleeping with her as soon as I can, I just need to make sure we are on the same page...any advice?

Escalate kino. Very simple

She has to feel comfortable with you touching her in order for her to feel comfortable sleeping with you. Sex is intimate touching. Work your way up to that level. Keep pushing until you feel resistance and then back off. What you say to sexually escalate usually will backfire in your face if you don't escalate kino properly.