Article 66a provides that a foreign national shall be expelled from Switzerland for a period of five to 15 years if they are convicted of, among other things, female genital mutilation (Penal Code Art. 124, para. 1), forced marriage or forced registered partnership (Penal Code Art. 181a), trafficking in human beings (Penal Art. 182), sexual acts with children (Penal Code Art. 187, para. 1), sexual coercion (Art. 189), rape (Art. 190), sexual acts with persons incapable of judgement or resistance (Art. 191), encouraging prostitution (Art. 195), aggravated pornography (Art. 197, para. 4, second sentence – pornography containing genuine sexual acts with minors), genocide (Art. 264), crimes against humanity (Art. 264a), serious violations of the Geneva Convention of 1949 (Art. 264c), and other war crimes (Art. 264d and 264h). Unofficial English translation available here.
Schweizerisches Strafgesetzbuch/Swiss Penal Code, Article 66a: Mandatory expulsion of foreign nationals for female genital mutilation and certain other offenses