関連ワード:  which method of birth control is most effective in preventing pregnancy    which method of birth control is most effective    which method of birth control is most effective in preventing pregnancy quizlet    which form of birth control is most effective    which method of birth control is the most effective and risk free    which form of birth control is the most effective quizlet    which method of birth control is least expensive and most effective    which method of birth control is the least expensive and most effective quizlet    which birth control method is most effective when used correctly    which of the following means of birth control is most effective in preventing aids  
結果 : which method of birth control is most effective