its worked on a points system. when all your team r stud around (like in agencies and such) talk to the one u want to pitch the ball first, then talk evry one else, then talk to the other 2 girls.

the screenplays also change. who tidus talks to in guadosalam can be changed (can b rikku or lulu) and who he rides to the temple on the snowmobile changes as well. in the guadosalam talk, it is obvious which responses give points to certain girls.

also on the screenplay in the airship before you jump onto sin can change.