It has long been Law & Order: SVU's M.O. to borrow story inspiration from international news. Naturally, a story as severe as the scandal surrounding Schwarzenegger's secret son (I'll spare you further alliteration) would be a treasure trove for a series focal on illicit sexual affairs. Of course, Arnold Schwarzenegger did not break any laws by cheating on his wife; that's where the writers come in.
The true nature of what the sex crime will be in the episode surrounding the Raines family (comprised of Andrew Raines—a celebrated philanthropist, derivative of Schwarzenegger—his wife Kathleen, and an illegitimate son, Tripp) has not yet been revealed for the episode which will broadcast early in the program's 13th season. This kind of high-profile case is just what will draw in the viewers, what with the loss of the beloved Detective Elliot Stabler (Christopher Meloni) and the gradual fade-out of Detective Olivia Benson (Mariska Hargitay). The season will premiere September 13.
Source: TVLine