Serafin also faces enhancements for allegedly committing crimes against more than one vicitm, which could lead to additional prison time if he is convicted.
Serafin began communicating with a 15-year-old victim on Facebook in October, according to prosecutors. He allegedly invited the boy to meet him in the parking lot of his apartment complex twice in November and forced him to perform oral sex.
Serafin is also accused of inviting a 14-year-old boy from his neighborhood to use his computer Jan. 10. Serafin is accused of sexually touching the victim. Later in the day he allegedly massaged a 10-year-old boy's bare back with sexual intent when the alleged victim visited his apartment.
At the time of the crimes, the defendant served as a referee for Oak View Soccer League in Huntington Beach.
If convicted, Serafin faces life in prison and must register as a sex offender for life.
Serafin, who is being held on $1-million bail, is scheduled for Feb. 1 arraignment.
The investigation is ongoing. Anyone with additional information or who believes they have been a victim is encouraged to contact Supervising District Attorney Investigator Anthony Sosnowski at (714) 347-8794.