It comes after a law blocking such a move was overturned.
Popular porn sites now display unproven health warnings thanks to Texas law::Popular online adult film sites in Texas are posting health warnings about watching porn, despite the fact a law requiring them to do so was blocked in August.
Because I didn't see it written in the comments yet, here is the warning:
"The sites display unproven claims that porn impairs ‘human brain development’ and ‘increases the demand for prostitution, child exploitation, and child pornography.’"