First, it encourages men to be responsible for their sexual behavior and reproductive behavior, and enhances their sense of responsibility for the society and the family. It also helps them discard the out-dated childbearing concept and requires them to take the major responsibility in restraining their sexual behavior and its consequences. Second, it is necessary for women’s reproductive health. Third, it is necessary for contraceptive use of men and the research of the status quo. It is only recently that male sexuality becomes an independent subject. Therefore, there are only a few contraceptive use of men. Men’s involvement contributes to developing new contraceptive use of men.