Enable the "Speed up time" code, then wait outside her house. The red circle will appear quicker, and your bar goes up faster. Additionally, after you play the mission to get Denise, wait until you can go on a date with her. From 60% to 100% sometimes you will have difficult dates (when you dance). Make sure you have already saved the game. If you are not skilled with the dancing, reload the game until you go on the date where all you do is drive. You should get at least 10% for going on the date, because the game gives you an extra 5% for her inviting you in for coffee. Use the following trick to get a perfect date with Denise. First, get her a gift (either a dildo from the police station or the flowers from the gas station near by). After that, give Denise the gift. Do not press B, press L instead. If you press B, you will use it as a weapon. Then, drive to Ten Green Bottles nearby on Grove Street. You will then take her home and your progress will go up.