really?
for how long? dont you think that he will be bored after a while
and move to the next one? or the first temptation that present
itself?
for some guys , sex are the ties that binds. personally for me
after a few dates , i will get bored if there is no sex.
so what is the magic number , what if its never coming?
this anticipation could easily backfire, its a stupid tactic, if
you feel like it - just do it! 
once you apply tactics in love and relationship , it will start to
be artifical, remember man are not dumb 
if you dont give him , he can go somewhere else