You can go out for a date with these ladies, sometimes you can go out for a meal or you can dance the night away.
For each successful date you will get a reward: extra progress.
You can practice dancing by walking into the disco when you are not on a date.
This is the same as when you are on a date, but not with your girlfriend.
A hint for the ladies who want to drive leisurely: drive your car in reverse, this will result in the speed she likes almost every time!