"San Andreas" can quickly increase the progress (that is, increase the intimacy) with his girlfriend by completing the dining task and taking his girlfriend to a high-end restaurant for dinner, which will increase the intimacy after the meal.
Complete the dance task and go to the ballroom to dance with your girlfriend to increase intimacy.
Complete the ride mission, drive until your girlfriend is excited, and send her home to increase intimacy, but you must be careful not to drive too fast or drag racing, otherwise the intimacy will decrease. When the intimacy reaches a certain level, after sending your girlfriend home (park the car on the red dot), you can press the Y key to enter, and then the intimacy will increase. When you arrive at your girlfriend's house, you don't have to step on the red dots and touch the doubles sign at the door.
You can start a doubles mission. After completing the mission, the intimacy between the two people will increase.