Answer to Question 1
Answer: Reactance theory posits that when people feel their freedom is threatened, an unpleasant state of reactance is aroused. One way people can reduce this unpleasant state is to engage in the prohibited behavior. Therefore, a message that is too strong can backfire and cause individuals to become more likely to engage in those behaviors. Thus, one tactic is to use subtle messages that do not make individuals feel as though their freedoms are being threatened.
Answer to Question 2
Answer: Attitude inoculation involves exposing people to small doses of arguments counter to their initial attitudes, like a vaccination against disease. In this case, you would expose your brother to weak versions of arguments that he might hear later from his peers (e.g., condoms look stupid, or condoms ruin the sensation of sex), and encourage him to refute those arguments (I can enjoy the feeling of sex a lot more if I don't have to worry about illnesses or getting you pregnant). In addition, you might give him some practice role-playing and show him ways to combat these pressures. This should make him more immune to more powerful persuasive messages later.
Comparison of group II self-splicing introns and the spliceosome
Major Causes of Death in U.S by Age Group
Curative Factors of Group Therapy
Algorithm for assessing a patient at risk for self-directed violence.
Children who witnessed violence in their homes
Deoxynucleotides (top) have an OH group at the position in the deoxyribose molecule