Thanks am taking a look at the site you've suggested.
There is no way you would have gotten anything from the touch.
If you want him to test, tell him "I think we should both test before we have sex. Its something that will make me comfortable to have sex with you." That way, its something you both are doing to be proactive, and you are accusing him of having anything. Besides, I always figure if the boy wants to get lucky, he can go pee in a cup and have some blood drawn, ya know?
Also, you sound as if you have anxiety about stds, and it might be because you don't really know how they are transmitted. www.ashastd.org has some great info on all the stds, and how you get them and don't.
AJ
I forgot to add I am not sure if any pre-ejaculatory fluid was on his hand when he touched me.