How much notice do you have to give? <a href=" http://www.moriborvidek.com/index.php/borkiralynok/13-borkiralynok/70-domonkosbernadett#storm ">buying viagra super force sildenafil coupon without prescription</a> The two-day tutorials are not cheap at 2,500 yuan ($410), more than half the average monthly wage in Shanghai. But a rising number of women are signing up for Ma's classes and similar sessions in other cities to learn about the anatomy, psychology and techniques of intimacy.