<human>: I have an odd question that I'm hoping for some advice with. When my girlfriend and I first got together, she seemed to really enjoy talking dirty. Honestly, it wasn't something I had much experience in (my ex didn't like it), but I enjoyed hearing it and even began to join in the dirty talk.

These days, I've found that I have become the only one doing this. My GF seems to have stopped altogether, apart from the occasional line. I worry that it's part of an, overall, decrease in her engagement in sex. We used to have sex all around the house and it was wild and really hot. Now, it'll be some foreplay on the couch and then we make our way to the bedroom. Also, it used to be, through foreplay, she became incredibly, um, ready. I loved knowing I turned her on that much. Now, though she still seems to enjoy what's going on, physically, there's a lot less of a reaction (though still within the normal range). 

I've talked to her about this and she says it's been harder for her since her life has, due to work, gotten a lot busier. She feels her mind is on other things much more and finds it hard to keep her mind focused when we're having sex or even switch her mind over to thinking about it, at all. I had expected this would be a temporary thing due to the change in schedule and was patient, but it seems to be the new normal. Her schedule isn't changing anytime soon, so it's not like a temporary thing I need to wait out.

I realize that, as a relationship progresses, there's always a certain amount of loss of passion. I just don't know what's normal and what I should be worried about.

Provide a brief overview of the text.
<bot>: Girlfriend used to talk dirty. Now she doesn't and seems, overall, less engaged with our sex life. Should I worry?