(a) Every person who, with knowledge that a person is a minor, or who fails to exercise reasonable care in ascertaining the true age of a minor, knowingly sells, rents, distributes, sends, causes to be sent, exhibits, or offers to distribute or exhibit by any means, including, but not limited to, live or recorded telephone messages, any harmful matter to the minor shall be punished as specified in Section 313.4.

It does not constitute a violation of this section for a telephone corporation, as defined by Section 234 of the Public Utilities Code, to carry or transmit messages described in this chapter or to perform related activities in providing telephone services.

(c)

1. (1) Any person who knowingly displays, sells, or offers to sell in any coin-operated or slug-operated vending machine or mechanically or electronically controlled vending machine that is located in a public place, other than a public place from which minors are excluded, any harmful matter displaying to the public view photographs or pictorial representations of the commission of any of the following acts shall be punished as specified in Section 313.4: sodomy, oral copulation, sexual intercourse, masturbation, bestiality, or a photograph of an exposed penis in an erect and turgid state.
2. (2) Any person who knowingly displays, sells, or offers to sell in any coin-operated vending machine that is not supervised by an adult and that is located in a public place, other than a public place from which minors are excluded, any harmful matter, as defined in subdivision (a) of Section 313, shall be punished as specified in Section 313.4.

(g) It shall be a defense in any prosecution for a violation of subdivision (a) by a person who knowingly distributed any harmful matter by the use of telephones or telephone facilities to any person under the age of 18 years that the defendant has taken either of the following measures to restrict access to the harmful matter by persons under 18 years of age:

1. (1) Required the person receiving the harmful matter to use an authorized access or identification code, as provided by the information provider, before transmission of the harmful matter begins, where the defendant previously has issued the code by mailing it to the applicant after taking reasonable measures to ascertain that the applicant was 18 years of age or older and has established a procedure to immediately cancel the code of any person after receiving notice, in writing or by telephone, that the code has been lost, stolen, or used by persons under the age of 18 years or that the code is no longer desired.
2. (2) Required payment by credit card before transmission of the matter.

(h) It shall be a defense in any prosecution for a violation of paragraph (2) of subdivision (c) that the defendant has taken either of the following measures to restrict access to the harmful matter by persons under 18 years of age:

1. (1) Required the person receiving the harmful matter to use an authorized access or identification card to the vending machine after taking reasonable measures to ascertain that the applicant was 18 years of age or older and has established a procedure to immediately cancel the card of any person after receiving notice, in writing or by telephone, that the code has been lost, stolen, or used by persons under the age of 18 years or that the card is no longer desired.
2. (2) Required the person receiving the harmful matter to use a token in order to utilize the vending machine after taking reasonable measures to ascertain that the person was 18 years of age or older.