If you are over 18 and solicit a minor under 18 it is a violation of the law and it is a felony charge.
You can not be 18 and have sexual relations with a minor. Parents can not consent to their minor being in a sexual relationship with an adult. A parent can not consent to their child breaking the law. Not sure what your situation is, but the good luck pertained to an 18 yr old dating a 14 yr old.
If you think it's legal then do a little experiment. The couple themselves told the police they were sexually intimate. The only answer in this situation is that you live in a town where the welfare of a child is thrown out the window.
Similarly, no protections are reserved for sexual relations in which one participant is a 17 year old and the second is a 18 or 19 year old. (a) Unlawful sexual intercourse is an act of sexual intercourse accomplished with a person who is not the spouse of the perpetrator, if the person is a minor.
For the purposes of this section, a “minor” is a person under the age of 18 years and an “adult” is a person who is at least 18 years of age.
California has seven statutory sexual abuse charges on the books which are used to prosecute age of consent and child abuse related crimes within the state.
One or more of these charges may be used to prosecute violations of the California Age of Consent, as statutory rape or the California equivalent of that charge.