Birth control options have greatly expanded in number and variety over the past few years. Innovations include the NuvaRing, which is inserted into the vagina and releases a constant stream of hormones, and an oral contraceptive that allows women to have just four menstrual cycles a year. The number of options for women who prefer nonchemical methods -- such as CycleBeads, which help track peak fertility days -- has also increased. Studies are also investigating a sperm "vaccine" for men.
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