If you are sure someone is NOT for you you can say 'I am sure you will find someone who is right for you, but I am sorry I don't think it's me. Be interesting by being interested Cut down the talk about yourself and ask him open ended questions. This also gives him the cue that you like to know a bit about someone before exchanging numbers or accepting a date. To some men, this can smack of 'checking for wallet-padding'. YET and the question may put them on the spot.
Men are much more activity orientated whereas women like to talk about emotions.
Asking them what they enjoy doing in their life will allow find out more about what makes them tick. If you give out your number, give the genuine one Carry a personal or business card to hand out. This way you know that when you give out your phone number you either give out the genuine one or not at all. Imagine what it must feel like plucking up the courage to dial a woman's number only to find it is the local Chinese take-away. If women are looking for equality then it is only fair that they do their share of the asking.