hi im new here but no so much new to pick up

at night game when im in a party or a bar i usually approach as the "nice guy" and if the girl is showing sexual interest or starts to send oi than i start to be more "sexually aggressive".
those cases are working well for me, but sometimes i get the filling from girls that i opened and got their number, that i should have been more aggressive and sexy instead of nice.. so im asking for some tips for re approaching a girl who i already now is into me and wants me to be more aggressive.
how do i overcome the first impression of the nice guy?? ty
