What do I have, why does it smell bad, why does it burn me during sex?

It is possible to experience a vaginal infection called "Yeast Vaginitis" which may cause symptoms such as increased vaginal discharge resembling cottage cheese, itching, pain during sex, irritation, and swelling of the labia. Risk factors for this infection include wearing tight synthetic clothing, taking antibiotics or corticosteroids, having sex, or using certain forms of contraception. If you suspect you have this infection, it is important to seek medical advice for proper treatment.