This Dating Life: Oh, This is Your Apartment?

On a third date recently, I inadvertently (or unintentionally, if you prefer) walked my date back to her apartment. I knew it was her apartment because we stopped what I had assumed was our aimless walking, and also because she said "This is my apartment, in case you were wondering why we stopped walking." I had no problem with the walk home; we were close by, and I was going to offer to do it anyway. This just seemed like a strange way, a request-less transport. Our second date had went really well, and the third seemed to build on that. At this point, I was expecting an invite up for dessert (or, you know, maybe S-E-X), but unfortunately, that didn't happen. After some good night "discussions", she told me what a great time she had and how courteous, charming, gentlemanly and handsome I was and retreated to bed. I was left wondering why it was so difficult to gain access to a woman's apartment, and not in a creepy burglar or stalker way. Is there a magic password, like Pee-Wee Herman's word of the day?