this is, lucky for you, a case where the guy does appear to have much respect for you and your body. If you truly feel the time is right to let him do more than kiss think thru the following:
Do you think this guy will run and brag to his friends if you let him go further?
Do you know in your mind exactly how far you ARE prepared to go and are you prepared to say no firmly when you hit that no-further point?
Do you want to go further with him just because you are afraid he wont like you if you dont?
if you answer all these questions honestly and those answers mean that your are comfortable going ahead then the answer is easy. Just take his hand and place it somewhere intimate, or if you are too shy for that just whisper 'we can do more than kiss if you want'. Thats all it will take for him to know.