If you are worried about losing sex drive, then tell your doctor that you don't want to take Yasmin or Yaz birth control pills. These birth control pills have a form of progesterone that offers a mild diuretic effect and also decreases your testosterone level. This decrease in testosterone is great for clearing up acne and lightening body hair, but it also dimishes your sex drive
I would recommend trying one of the tri-phasic birth control pills, such as Ortho-Tri-Cyclen which most closely mimic your natural cycle.