There are ads on this site that say
Find single matures in your area
A couple months ago, Stack Exchange decided to try out ads across the network. Some inappropriate stuff slips through sometimes. In that case, per the official announcement, please report it as follows:
If you wish to report an advertisement, please take a screenshot of the ad and paste the URL (if possible) along with the site where you saw it to a comment or answer. I'll report it to the ads team and we can track it down to investigate.
In the meantime, given how intrusive some of these ads can be (remember this?), you may want to use an adblocker.