Why on earth would a woman who is providing a service (pouring coffee, wiping tables, being friendly to customers), refuse a tip given to her for doing her job? She did the job. She poured the coffee, she wiped the table, and she was polite to her customers. Her job does not involve accepting sexual advances. The tip is not payment for friendship/romance. The tip is for pouring the coffee. She poured the coffee. If you want to pay for a different kind of service, and that is legal in your area, then you can pay for that. But that is not the job of a barista.