People react differently to that kind of thing. I can't tell you how she will react. I know couples who have broken up over that kind of thing and couples who have grown stronger through the process.
Be honest with her from the beginning. Maybe ask her to go shopping with you, and point out the...
Oh, good for them, then! =D
The US used to have sodomy laws, which made it illegal to participate in sodomy, which was defined as anal or oral sex--which not only made gay sex difficult, but it took a lot away from straight sex, too!
MC: Beach!