Contraceptives

I think some one's culture/beliefs/practices plays an important, if not the biggest, role in a woman's choice of contraception.
A woman who lives in a developing country, for example, isn't going to have the opportunities and resources available to her that allows her to take an active role in her contraception decisions. They may use natural birth control methods, that a woman from the United States may consider primitive. However, that is not to say that a woman who migrates to the United States is going to adopt our methods of birth control.
Another example of influence in our society is religion (I, personally, believe this is the single, most important factor in a woman's decision about reproductive health). It is highly plausible that a woman who is a firm pro-life advocate would not use an IUD or Plan B, for example. Whereas, a woman who is pro-choice is likely to be more open to all forms of birth control methods.
Another example of influence is a woman who practices the organic, all natural approach may be more inclined to use 'fertility awareness'/withdrawal methods.
As a side note: I, personally, am open to all methods of birth control. I think it's extremely important that women have 100% control of this issue. I don't believe that a church, family and especially the government should have any control or say so.