One pharmacist's educated opinion - Excluding the increased risk of pelvic inflammatory disease, hormone containing products, such as birth control, can all cause side effects and alter the body's natural production of hormones. Many cases of PMS, depression, migraine headaches, and other "diseases" especially in young women, could be hormonal imbalances that can be further exacerbated by synthetic hormones found in contraceptives. The Mirena IUD, the pill, Nuvaring, Depo-Provera and the patch all contain hormones and do not protect from STD's, including HPV which has been recently linked in a large part to cervical cancer. Condoms in my opinion are the best option because they are effective, readily available, inexpensive, contain no hormones, and protect against STD's.