Existing as a woman is not cheap. 

Every 3-4 weeks:

Nails: $100
Skincare $150 (facials, botox, cleaners, SPF)
Feminine products: $40-50 
Hair: $50-150 (depending on the month)
Threading, waxing, or laser: $20-200

And the list continues. 

How are women still underpaid?