Again, not by trying to probe her with your penis at every given opportunity. You guessed it, I'm talking about the roots of romance, namely lingerie. Another hot seller is the Chemise that is basically a silky plain mini dress that drapes her body and ends at her thighs.
Teddies are nice to look at, to say the least.
Sometimes the clasps close at her vagina, which may sound like quite an appropriate district to be starting the party, but can get quite frustrating. Your best bet would be to buy one that goes on just like a bathing suit instead. Wax on, wax off. Life is good. Perhaps she's just comfortable around you, or maybe she literally has no idea that a thong might drive you to insane proportions.