Question: Which form of intercourse that involves the insertion and thrusting of the erect penis into a person's anus is included in the Measure B law?

Context paragraphs:
Deep-throating: Deep-throating is a sexual act in which a person takes a partner's entire erect penis deep into the mouth and throat.  The practice is a type of fellatio where the giving partner is in control, while deep throat penetration by an actively thrusting partner is called irrumatio; both are a form of oral sex.  For deep-throating, the penis has to be long enough so that it can reach the back of the recipient's throat.  The technique and term were popularized by the 1972 pornographic film "Deep Throat".

Human reproductive system: The human reproductive system usually involves internal fertilization by sexual intercourse.  During this process, the male inserts his erect penis into the female's vagina and ejaculates semen, which contains sperm.  A small portion of the sperm pass through the cervix into the uterus, and then into the fallopian tubes for fertilization of the ovum.  Only one sperm is required to fertilize the ovum.  Upon successful fertilization, the fertilized ovum, or zygote, travels out of the fallopian tube and into the uterus, where it implants in the uterine wall.  This marks the beginning of gestation, better known as pregnancy, which continues for nine months as the fetus develops.  When the fetus has developed to a certain point, pregnancy is concluded with childbirth or labor.  During labor, the muscles of the uterus contract and the cervix dilates over the course of hours, and the baby passes out of the vagina.  Human infants are nearly helpless and require high levels of parental care.  Infants rely on their caregivers for comfort, cleanliness, and food.  Food may be provided by breastfeeding or formula feeding.

Comparison of birth control methods: There are many different methods of birth control, which vary in what is required of the user, side effects, and effectiveness.  It is also important to note that not each type of birth control is ideal for each user.  Outlined here are the different types of barrier methods, spermicides, or coitus interruptus that must be used at before every act of intercourse.  Immediate contraception, like physical barriers, include diaphragms, caps, the contraceptive sponge, and female condoms may be placed several hours before intercourse begins (note that when using the female condom, the penis must be guided into place when initiating intercourse).  The female condom should be removed immediately after intercourse, and before arising.  Some other female barrier methods must be left in place for several hours after sex.  Depending on the form of spermicide used, they may be applied several minutes to an hour before intercourse begins.  Additionally, the male condom should be applied when the penis is erect so that it is properly applied prior to intercourse.

Penile fracture: Penile fracture is rupture of one or both of the "tunica albuginea", the fibrous coverings that envelop the penis's "corpora cavernosa".  It is caused by rapid blunt force to an erect penis, usually during vaginal intercourse, or aggressive masturbation.  It sometimes also involves partial or complete rupture of the urethra or injury to the dorsal nerves, veins and arteries.

Phallus: A phallus is a penis, especially when erect, an object that resembles a penis, or a mimetic image of an erect penis.

Measure B: Measure B, also known as the "County of Los Angeles Safer Sex In the Adult Film Industry Act," is the law that requires the use of condoms in all vaginal and anal sex scenes in pornography productions filmed in Los Angeles County, California.  The measure also requires porn production companies to obtain a health permit prior to production and to post the permit and a notice to performers regarding condom use during production.  All individuals involved will also be required to pay 1600$ every 2 years.

Anal sex: Anal sex or anal intercourse is generally the insertion and thrusting of the erect penis into a person's anus, or anus and rectum, for sexual pleasure.  Other forms of anal sex include fingering, the use of sex toys for anal penetration, oral sex performed on the anus (anilingus), and pegging.  Although the term "anal sex" most commonly means penile-anal penetration, sources sometimes use the term "anal intercourse" to refer exclusively to penile-anal penetration, and "anal sex" to refer to any form of anal sexual activity, especially between pairings as opposed to anal masturbation.

Woman on top: Woman on top, also called the cowgirl or riding position, is a group of sex positions in which the man lies on his back or sits, the woman straddles him facing either forward or back, and the man inserts his erect penis into the woman's vagina or anus.

Frotteurism: Frotteurism is a paraphilic interest in rubbing, usually one's pelvic area or erect penis, against a non-consenting person for sexual pleasure.  It may involve touching any part of the body, including the genital area.  A person who practices frotteuristic acts is known as a "frotteur".  Toucherism is sexual arousal based on grabbing or rubbing one's hands against an unexpecting (and non-consenting) person.  It usually involves touching breasts, buttocks or genital areas, often while quickly walking across the victim's path.  Some psychologists consider toucherism a manifestation of frotteurism, while others distinguish the two.  In clinical medicine, treatment of frotteuristic disorder involves cognitive behavior therapy coupled with the administration of a SSRI.

Sexual intercourse: Sexual intercourse, or coitus or copulation, is principally the insertion and thrusting of the penis, usually when erect, into the vagina for sexual pleasure, reproduction, or both.  This is also known as vaginal intercourse or vaginal sex.  Other forms of penetrative sexual intercourse include anal sex (penetration of the anus by the penis), oral sex (penetration of the mouth by the penis or oral penetration of the female genitalia), fingering (sexual penetration by the fingers), and penetration by use of a dildo (especially a strap-on dildo).  These activities involve physical intimacy between two or more individuals and are usually used among humans solely for physical or emotional pleasure and commonly contribute to human bonding.

Supporting paragraphs: Measure B Anal sex
Answer: anal