It sounds like you was just lucky if everything went well as you say.A good tip I read or heard about with first dates is not to have a full blown evening together with pre- dinner drinks maybe a show and then a meal together and the reason being usually you know within the first half hour whether you are both compatible and the rest of the evening can be hell if you both don`t click.
The suggestion was to meet for coffee at some public place and spend maybe a half hour to one hour getting to know each other better and do that a couple or a few times before having a full evening together .
Well I thought it was a sensible suggestion anyway.
Good luck