Shallow reason for the girls to be shaving. $$$$. I cannot afford full waxing on a regular basis, so there is no way I could afford 3 of us.

Honestly I see no problem with shaving, the razors are so much better than what they where when I was a kid. Now that was a painful experience when one of those suckers knicked you!
As for the old argument that is toughens/thickens the hairs, well personally I think that is a load of rot. I know if I let myself get hairy and the hair has a chance to go through a full growth cycle, my legs look like they have never been shaved (hey I have fooled waxers)

I think though I will get them waxing for eyebrows and bikini line (over summer).