With Memorial Day is behind us and summer in full swing, the demand for summer beauty treatments--pedicures, bikini waxes, spray tans--sky rockets. Many of these services involve a technician--usually a virtual stranger--getting all up in your personal space. So how much do you tip? And what happens when you're not happy with the service you received? Is it OK to totally stiff someone who just spent 20 minutes getting intimately acquainted with your bikini line? We investigate.