<human>: Provide a brief overview of the text.

So my girlfriend (20) and I (21) have had a pretty good relationship for almost 4 years now. We were the typical high school romance and now both at the same university and have been living together for a few months now and all is going well. However, recently things seem to have slowed down between us. We still love each other and really don't see us separating any time soon, but this feeling makes us nervous.

We do a lot together, and always have. We are almost the couple that is attached at the hip. Our date nights are kind of few and far between and they are usually the same thing. We also share the same pool of friends and may end up working in the same office together. Sex has been a very regular thing with us, however recently it seems to have become routine. I've raised concerns that we may be either too involved in each other's lives or are not doing enough interesting things as a couple to maintain interest. She shares this concern, but has also added the fact that I'm the only one she has ever slept with to her list of concerns as she never imagined being with one man through her entire life, and is naturally curious. I feel as though part of this is growing up together and taking on a more serious relationship, but she has her doubts. 

We've started to take some action by making plans to go on more elaborate dates and for us to become more experimental in the bedroom (being monogamous.) However, I'm curious if this is enough. So, any suggestions reddit?
<bot>: Couple who has seem to run out of spark, of things to keep us interested in each other, looking for advice on how to liven things up again between us.