Cal. PEN § 288.5

(a) Any person who either resides in the same home with the minor child or has recurring access to the child, who over a period of time, not less than three months in duration, engages in three or more acts of substantial sexual conduct with a child under the age of 14 years at the time of the commission of the offense, as defined in subdivision (b) of Section 1203.066, or three or more acts of lewd or lascivious conduct, as defined in Section 288, with a child under the age of 14 years at the time of the commission of the offense is guilty of the offense of continuous sexual abuse of a child and shall be punished by imprisonment in the state prison for a term of 6, 12, or 16 years.

(b) To convict under this section the trier of fact, if a jury, need unanimously agree only that the requisite number of acts occurred not on which acts constitute the requisite number.

(c) No other act of substantial sexual conduct, as defined in subdivision (b) of Section 1203.066, with a child under 14 years of age at the time of the commission of the offenses, or lewd and lascivious acts, as defined in Section 288, involving the same victim may be charged in the same proceeding with a charge under this section unless the other charged offense occurred outside the time period charged under this section or the other offense is charged in the alternative. A defendant may be charged with only one count under this section unless more than one victim is involved in which case a separate count may be charged for each victim.