Take them flowers and kissing is also a good way to boost your percentage.
For Millie,make sure you date her when you using your gimp suit(that black suit you get when you follow her to the xxx somekind shop) while wearing this,she will had that romance in bed with you everytime you visit her.(No need for having dinner or whatever.
Once in there, get the jetpack cheat and fly upwards in the dark corners of the gym. If you walk around you can stumble upon weapons, armor and sometimes even invisible water.... Hop the fence to the Los Santos airport, hop in the SHAMAL, and keep flying it for about 25 minutes. Note: The only way to get out of the wide screen mode is to book another flight, and either jump out of the plane, continue to the other airport, or do a mission. When typed in correctly a confirmation message will appear.
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Go on a date with one of your girlfriends (as long as she enjoyed her date this will work, if she hasn't enjoyed her date this tip will make your girlfriend meter decrease) then take her home once she says we should do this again run over to her door and use the 2 player symbol (you will need another analogue controller) and start a multiplayer game and if you keep kissing and giving her gifts your girlfriend meter will continue to rise faster.
Three different activities are available during dates.
These include a visit to a restaurant (including fast food chains, diners, formal restaurants and bars, alongside the bar in dance clubs), dancing at a dance club, and driving around.