Art. 5 provides that the Swiss Penal Code also applies to any person who is in Switzerland, is not being extradited, and has committed any of the following offenses abroad: (1) Trafficking in human beings (Penal Code Art. 182), sexual coercion (Penal Code Art. 189), rape (Penal Code Art. 190), sexual acts with a person incapable of proper judgment or resistance (Penal Code Art. 191) or encouraging prostitution (Penal Code Art. 195) if the victim was less than 18 years of age; (2) sexual acts with dependent persons (Penal Code Art. 188) and sexual acts with minors against payment (Penal Code Art. 196); (3) sexual acts with a child (Penal Code Art. 187) and sexual acts with a minor of age less than 14; or (4) aggravated pornography (Penal Code Art. 197, para. 3 and 4) if the objects or representations depict sexual acts with minors. Unofficial English translation available here.
Schweizerisches Strafgesetzbuch/Swiss Penal Code, Article 5: Offenses against minors