1, communicate with students privately: the class teacher should communicate with students privately to understand the reasons and motives for them to wear condoms. In the process of communication, the class teacher should keep calm and patient to avoid giving students unnecessary pressure.

2. Emphasize the importance of sex education: the class teacher should emphasize the importance of sex education to students and let them know about sex knowledge, sexual health and sexual morality. At the same time, the class teacher should also let the students understand that condoms are a tool to protect themselves and others, but they are not the only way to solve all sexual problems.

3. Guide students to use condoms correctly: The class teacher should guide students to use condoms correctly, including how to wear them correctly and how to use them correctly. At the same time, the class teacher should also let the students know that using condoms can not completely avoid the risk of sexually transmitted diseases and pregnancy, so we should pay attention to other preventive measures while using condoms.

4. Encourage students to seek help: If students encounter any problems or puzzles related to sex, the class teacher should encourage them to seek help, including teachers, parents or other professionals. At the same time, the class teacher should also provide some reliable resources or information to help students better understand and deal with sex-related problems.

When students encounter problems or puzzles related to sex, the class teacher can guide students to seek help:

1. Encourage students to express their feelings and problems: the class teacher should encourage students to express their feelings and problems, so that students know that someone is willing to listen to their voices and understand their confusion.

2. Provide reliable resources or information: the class teacher can provide some reliable resources or information, such as the school's psychological counseling center, sex education courses, parent-teacher conferences, etc. Let students know where to ask for help.

3. Guide them to seek professional help: If students need more professional help, the class teacher can guide them to seek professional help, such as doctors and psychologists.

4. Emphasize the importance of seeking help: the class teacher should emphasize the importance of seeking help, so that students can understand that only seeking help can solve problems and puzzles better.