Fox,
I'm assuming you're talking about casual relationships here?
At some point -- and that point, on average, is usually around the 3-month mark -- a girl will start pushing for you to do things that work toward commitment on your end. The trick is to never really take the girl out on "dates" to begin with; I usually won't even see a girl outside of my own place (or hers) until at least the three month mark, and then from there, if I like her, I'll maybe start taking her out to a bar, or a movie, or a club (or whatever). The only dates that happen prior to the 3-month mark are the dates that we went on before I bedded the girl.
Don't worry too much about dates. Dates are for the process that lead UP to sex; once you've had sex, the only dates you should really care about (and the ones she cares about) are at your place ending in sex. If she starts pushing for dates later on in the casual relationship, and you really like her to the point where she's a potential long-term candidate, then you can start doing more things together (and you'll have plenty of options because you hadn't been taking her on tons of dates up until that point).
- Franco