Andrew Appleton, 51, was arrested by police in nearby Moscow, Idaho, on Tuesday after the alleged victim came forward.
The 18-year-old woman told police that Appleton intimidated and coerced her into a sexual relationship, starting when she was 16 years old, and continuing for two years.
The alleged rapes happened in Moscow and California.
Appleton is an associate professor of politics at Washington State University in Pullman, where he has been a faculty member since 1994. University spokesman Darin Watkins says Appleton has been removed from his duties and is no longer on campus.
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