Being involuntarily violated in the anus multiple times certainly counts as rape in my book.
The headline was more appropriate after reading the facts listed in the article. I don't know what else you could call it and I thought about it for a minute. I assume you are upset with the use of the word rape. The victim here was subjected to the unwanted and repeated penetration of the his rectum under the guise of an investigative premise to look for evidence of a crime based on a suspect's perceived contraction of his but muscles? Maybe Webster should update it's definition of rape.