Some of the content that you post to your website may not be suitable for some of your visitors. Instead of letting your visitors see your content without a warning, you should use plugins such as Content Warning to give your visitors a heads up about the nature of your posts. Content Warning lets you tell your visitors about the type of content they are about to visit and redirects the folks who do not want to see it to some other page.
Content Warning gives you full control on what gets displayed on your site. You can change the text and the behavior of the script from its options page. It also gives you control on exit options (e.g. the URL you want to redirect your visitors too). Cookie options can be changed as well.
Content Warning may not be necessarily for all sites. But if you are going to have graphic or adult-only content on your site, providing a heads up to your visitors is a must. This plugin makes that possible.