Google doesn't allow Google Ads placement with content that is mature, adult in nature. If you have ads placed on a website that has such type of content, your Adsense account may be suspended.
Find out more about what exactly that content is which Google considers as mature/adult.
Pornography or Nudity
Content including images, videos, games or text that describes nudity or pornography is not allowed. Such kind of content showing real people or animation - both are not acceptable.
Indecent content such as women wearing see-through clothes, close-up of private parts of men or women, striptease, kissing and all other such kind of material is not allowed
Content showing bestiality, necrophilia, bondage, sadomasochism and similar is also strictly prohibited.
Display of sex toys, lubricants, breast enlargement medication/tools - all such kind of material is not acceptable.
Websites are not allowed to display Google ads that contain any kind of sexual gratifying content like sexual jokes, sexual forums, excessive profanity, and erotic stories
Sex Health Tips/Discussion
Google ads are also not allowed to be displayed on pages where sexual tips are mentioned like advice on sexual performance, or where discussions happen on sexual transmitted disease, sexual health, etc.
Any website that allows men and women to search for registered people's profile for dating, marriage or to involve in any sexual activity is not allowed to display Google ads.
Hyperlinks on a page are not allowed that take people to a site or page where any kind of material is present as mentioned above.
This was the list of mature/adult content that violates Adsense policy. All of the aforementioned type of content cannot be present with Google ads. If you are already running Google ads along with mature/adult material, it is advisable that ads be removed immediately to avoid your Adsense account suspension.