Well other versions, so Cell games Bulma, World Tournament Chi-Chi or Sayian Saga Chi-Chi, GT Videl, Super Videl.
Goten's girlfriend from GT.
I think there's easily enough girls + alt versions of girls for KP4 and 5, and maybe 6.
But I doubt it could go past 6.
Unless....like with Love Triangle Z, we start getting into group sex.
Like, for example Videl catching Roshi with Pan, so he uses his hypnosis technique or something and fucks her and her daughter at the same time.
Or Roshi goes through time and abducts different Bulmas and fucks them all together.