It is illegal for an adult (someone 18 or older) to have sex with a minor (someone younger than 17), even if the sex is consensual. Those who break the law have committed statutory rape (classified as sexual assault in Texas).

Is it illegal for an 18 year old to date a 15 year old with parental?

In a Nutshell: Sex between an 18 year-old and a 15 year-old is illegal in California, meaning any touching of “private parts” of either, even with consent of both parties (and perhaps even the parents of each teenager) is illegal in California because the age of consent is 18.

Can a 15 year old give consent in Texas?

17: It is legal for a person to have sex with someone who is under the age of consent so long as both parties are at least 14 years old and under 21 years old.