If your friend calls but you aren't able to hang out, respond positively and then call immediatley afterwards to cancel the activity. There are five different girls which Niko can date, two of which are unlocked automatically during the storyline, and the rest of which are available via the in-game internet.
Call one of the girls to arrange a date, then pick her up within 1 hour (2 real-time minutes) and take her to one of the activities shown on the map.
Each girl has an 'initial opinion' of each activity that is available, and each time you take her to a specific place her opinion of it drops by 5, while her opinion of all similar places drops by 1.
For example, if you visit the Cluckin' Bell in Star Junction her opinion of it drops by 5, while her opinion of all other Cluckin' Bells in the city drops by 1.
Don't take your friend to an activity that he doesn't like or your 'like stat' will reduce.
You can perform upto four activities on each outing in order to give your 'like stat' the highest possible boost.
Also known as Carmen Ortiz, this girl likes you to be as high-class as possible. You will be notified by email that you have a chance to date SOBOHOE, aka Carmen, the next day at midnight.
After a date, you need to wait 5 hours (10 real-time minutes) before calling your girlfriend again.Don't call her too frequently or her respect for you will drop.You can date as many girls as you like, but the more you take on the harder it becomes.A successful date increases your 'like stat', and afterwards the girl may invite you in for some "hot coffee".You should also consider the girl's likes and dislikes listed in the profiles above - adhering to these will further increase your 'like stat'.
When her opinion of a specific place falls below 25, she refuses to go there anymore.