How to get to know if girl has sexual disease or not before having sex with her?

Say you have gone on a few dates with her. How do you get her to admit if she has sexual disease before having sex with her (if she has any)?

Please be easy on me as I'm shy and inexperienced at this game.

"Getting her to admit" is a revealing turn of phrase, as it suggests that you feel you have the higher moral authority. If you want sex with someone you don't like or respect, but want sexual health reassurance, just wear a condom.

Well there's no sure way without getting her checked up, or when you're about to plow and her private parts looks strange.

You have to weight up what they tell you, how much you trust each other etc. and make a decision on what to do. I guess in some relationships testing before unprotected sex is the way, other times you might accept the situation without. Most good things in life come with a degree of risk to be assessed. My gfs like me have always been modest in their number of partners and I have gone with sex without a condom after a short while with no tests. My current gf told me she had had herpes the first time we ended up in bed (I really respected this) and after a bit of research I concluded it was no big deal. We've been together a long while and I've never had an outbreak and shes only had one mild reoccurrence.

Problem with getting both tested is I can't surprise her!