Depends...really it shouldn't matter as long as you are happy. Also what would you term as a date??? I date my girlfriend formally about every one to two weeks. But we get together informally to just hang out together. So we see each other and spend time together alot, but we go fairly regularly on formal dates. One thing I would say is make it spontaneous, don't have a fixed schedule where yall go out every Tuesday night. HAve fun make it random.
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You should ask her what she wants to do,skating is cheap and I'd love it,picnics can be romantic.
Expensive restaurant if you can afford it or someplace she always wanted to go. Use alternatives if you can make your place or some other place seem like where she would like to go.