The study evaluated if interactive theater in school sex education affects student knowledge, attitudes and behavior regarding condom use. The intervention group got a play, value exercises, chlamydia games, condom school and interactive replay with professional actors and staff from a youth guidance center. The control group got standard sex education from school staff, based on the education guidelines of the Swedish National Agency for Education.

The spread of chlamydia indicates that current preventive work with condoms is insufficient. Research shows that reasons behind increased chlamydia include youths taking more sexual risks, due to altered attitudes and sexual behaviors. Since only condoms protect against both sexually transmitted infections (STIs) and unwanted pregnancy, the goal of the World Health Organization (WHO) chlamydia prevention program is to increase condom use. Research suggests that school is the most important arena for sex education, reaching all youths early in life, when many values on sex and relationships are instilled. International studies on theater in sex education indicate effects like increased knowledge on the topic, and partially changed attitudes and behaviors among youths. Furthermore, several studies show that youths feel theater is a good method for sex education and a supplement to standard education.

Inclusion Criteria:

• students in eighth grade
• could read and understand Swedish

Exclusion Criteria:

• students in special education.

De-identified individual participant data for all primary outcome measures will be made available on request.