menstrual disorders
"I had the worst experience on Yaz!  I did not gain a pound the entire time I was on the pill, but I had other horrible side effects.  I would "spot" all month long a very thick, black discharge.  This discharge literally ruined my sex life.  I was too nervous to have sex, and on the occasion I did have sex and my boyfriend noticed the black discharge, he no longer could perform either.  Also, my periods lasted on average 10 days and was very heavy all 10 days.  "