then either stop pulling 18+ content or stop using adsense.
adsense TOS says , you are , the owner of website is responsible for the content where adsense ads are being shown. either use moderation or dont use adsense ., or they will kill your account., if thats your site and thats your adsense ads /.
ref:
User-generated content overview - AdSense Help
Common UGC challenges - AdSense Help
what you can do.
1) create a stop words list
e.g. penis,pussy,vagina,rape,sex,porn etc etc., last time i checked there were like 200+ words.,
and depends on the script and language its coded and DB solution its using.
add one field in DB main content table is_adult set default 0
do a cron job/while pulling videos from api which will check if the title/descrption of video contains one of the stop words , set is_adult = 1 for that video.
and while showing the video, if is_adult = 1 then dont show adsense ads, show exoclicks or some other adult friendly ads.
/.
hope this helps.,
on a side note, adsense doesnt allow sites like this, coz there is no added value/content to the videos/page and you cant use only youtube videos as content, you gotta write some content too and use YT videos as additional content,
i cant recall where i read that but trust me on this. been there, done that. few complaints and boom your adsense account is gone.