Child sex tourism is tourism for the purpose of engaging in the prostitution of children, which is commercially facilitated child sexual abuse. From Wikipedia
Holmberg, one of the longest-serving state senators in the US, allegedly made repeated trips from North Dakota to Prague between June 2011 and November 2016 with the intent of engaging in sex acts with a minor and received material involving a minor in explicit conduct from November 2012 to March 2013. The ex-senator pleaded not guilty, with his lawyer highlighting that the alleged conduct occurred over a decade ago; if convicted, he faces up to 50 years in prison.