A couple's sex life should never be some "dark little unspoken secret" in the relationship... I don't know about you guys, but I don't settle for that crap. You should be able to talk about all aspects of the relationship, and if one person is uncomfortable with speaking about something the communication factor of the relationship suffers. Sure, the sex is good now, but what about down the road when things start to fizzle... and she still won't talk about it, how do you go about fixing things or suggesting solutions? To me, when I'm with a gf and friends, sex is just as open a topic as the weather. I enjoy talking about it... and bragging about it
Anyways, it depends on the person, but two months doesn't seem like enough time for her to get comfortable enough to start talking in-depth about sex.