It means that once you turned 17, it’s was not illegal to have sex with him (of course, if Mom and Dad find out about it they may very well forbid you from having any contact with him at all, and they have the right to do that). Having sex prior to turning 17 was illegal. Even though you can now legally have sex, you do not have the right to runaway and move in with him, and Texas does have laws against harboring a runaway.Quoting AnonymousOne

