Amends GS 15A-1340.17 to provide that sentences for Class B1 through E felonies for offenses that are subject to sex offender registration are increased by 51 months over the existing sentences. Amends GS 15A-1368.2 to specify that prisoners subject to the new sentence are to be released 60 months before the end of their sentence (after service of the minimum and receiving credit for any earned time) and placed on post-release supervision. Amends GS 15A-1368.2 to specify that person may not refuse post-release supervision and that refusal is punishable by contempt of court. Time spent in incarceration for contempt is not credited against the original sentence. Specifies that willful violation of post-release supervision conditions to cause revocation is refusal to accept post-release supervision. Makes corresponding changes to contempt statutes in GS 5A-11. Contempt provisions effective when becomes law, and remainder of bill effective December 1, 2011, for offenses committed on and after that date.