If you're reading this, you probably have (or need to implement) an Age Verification Restrictions: Does Your Site Need Them? . Suggested Tools: The Content Warning plugin provides you with a simple warning popup.
It's harder to justify getting them for new content on a website you just it by clicking Report a cookie warning in the extension's options menu.
If you want users to visit your adult site for a minute just to get one or two things, then at the very least, have the users read an agreement, then verify they read it.
A website hosted on different server not blogger has adult content, should adult 18+ 'content warning' be shown when a user visits the website? Is there any.