I'm just wondering about something?

So anyway, my girlfriend and I were playing a game in Facebook chat. She calls it the "situation game" in which we basically start out with a situation and go from there (like for example, my house, and nobody else will be there for the weekend.) Anyway, we were doing this for over an hour, and things were getting really heated. She said that she wants me right there, right now. She was obviously turned on, and so was I. Then she suddenly she said "i gtg... ttyl love you" I know there's a legit reason for this, but I was just wondering. I'm pretty sure I know what she went offline to do. What do you guys think?