It would depend on what you are looking for and what part of Metro manila. If you are looking for just bar girls and quickie fun, I would say Poblacion Makati or Malate area in Manila. If you are venturing outside metro, I would say Angeles. Check out the usual girlie joints or karaoke bars.
If you are looking for casual, there are tons of malls my friend. Check out the sales ladies. Very pretty and friendly.