Dating gurus advise making the partner wait three days, in order to establish a kind of formality and courtesy in the relationship that is not over-familiar.
This is also recommended as a technique for men to make women angst over their future with him and therefore, apparently, cause her to want that second date even more.
Startling remarks such as "I am glad I have finally found my soul mate! Women, in particular, have a bad habit of assuming that going on a date automatically means that the two of you are now a couple.
For instance it is not a good idea to call the date at work.
Unless your date has a randy reputation, women should know that he is more than likely sitting at home alone eating a frozen dinner and balancing his checkbook.
Timing and tact is definitely of the essence regardless of who calls.