Becaus it is better then diving in head first to find out that she.. I mean it, is very shallow.
To see if the waters nice and calm. ;)
To see if you are a women, he could trust, be dependable, have respect for yourself, to play a little, to check out if the girl does like you -you dont have to bite the bate, remember he has to trust himself around you, if you guys are going to make something of your attraction and what you have sofar, he has to know that your not going to be easy for other men ,if you are with him, then it stands to reason you will if things get boring. They wont if you take it slow. Baiting, its great, make yourself woman girl worth fighting for and worth him working hard for. Xx
The fishing is often better than the catch.
I assume, because it's fun to mess with people because you can.