The natural activity is an important composition of the humanity lives, however, while brings joyfully to the humanity, helps with the humanity multiply, the natural activity also has brought many worries to the humanity, those matters including AIDS, and venereal diseases dissemination.

　In recent years, some overseas experts summarized the venereal diseases and  AIDS prevention experience, proposed the prevention venereal diseases and AIDS "ABC" principle. “A”  here reference to the first letter of Abstinence (endures wants), that is to say, if the person takes no activities, the dangerous of infecting venereal diseases will be greatly reduced. Only if the young people have grasped the knowledge of preventing venereal diseases and AIDS, learn to adjust the natural impulse, observed the social moral standard, could they avoid rashly being involved in the dangerous natural activity, and cause harm for others and themselves. “B” in the “ABC” principle references for the first letter of the English phrase “Be faithful” (to be a loyal person). That means, for the ones who do not abstinent, they should be loyal to their other halves. Have sex act with the multi- people is the important way for disseminating venereal diseases and AIDS, for that the more person contacted in the natural activities, more danger to contact with the one who is sick. If point “A” and “B” could not be achieved, the letter “C”(the first letter of the English word “Condom”) tells us that, use condom in the correct way can also reduce the opportunity of infected by the venereal diseases and AIDS.

    In the proposed “ABC” principle of preventing venereal diseases and AIDS, “A” and “B” are the most safe ones, however, that does not means everyone must obey these two points, so the point “C”(Condom) works as the last security screen for the ones could help adjust himself. For using condom to prevent venereal diseases and AIDS, there are things we must emphasize:

    (1) Using condom in the natural action could reduce the opportunity of being infected by venereal diseases and AIDS, but condom is surely not the 100% security screen. For that if there is skin damage in the area the condom does not cover, there could be rooms for infected by venereal diseases and AIDS;

    (2) The worry way to use condom or bad quality condom could also do harm to the effect of preventing.