Actually, I think Yuffie starts out at 0 and Barret starts out at -20...

Also, the "affection values" only relates to who goes with you on the Gold Saucer date.

I've seen the dates with Aeris, Tifa, and Yuffie. I thought the one with Yuffie was pretty funny. Has anyone actually seen the one with Barrett? I imagine it is pretty funny as well.