The former - because not all birth control is about 'breaking' the reproductive system.
Maybe the pill is a better example - it is used for many reasons beyond a desire not to conceive:
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Taking oral contraceptives (OCs) can slash your risk for both endometrial and ovarian cancer by more than 70 percent after 12 years; even just one to five years may lower your risk by 40 percent. They work by reducing the number of times you ovulate in your lifetime: Ovulation may trigger cell changes in the ovaries that can lead to cancer
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So, if a woman has a family history of ovarian cancer, the pill is one way of reducing her high risk factor.
http://www.webmd.com/sex/birth-contr...-take-the-pill
It also, by stopping ovulation can reduce period pain. For women who suffer very bad periods and blood loss this can be a serious health benefit.
And one of the most common medical reasons for taking the pill:
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Endometriosis, a condition in which uterine-lining tissue grows in other pelvic areas, can lead to scarring, severe pain, and sometimes infertility. The Pill stops the growth of tissue in other areas by reducing the hormones that cause the lining to build up.
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