There are a lot of sources. Try the following search engine queries:

• Nick Fuentes streams gay porn

• Nick Fuentes Catboy Date

They’re talking about this one:

Lots of info on Nick can be found on his RationalWiki entry. See the “Haggard’s Law” section for info and links to sources about the things I mentioned.

Wait’ll you hear about that time Fuentes accidentally streamed himself watching gay porn. Or his date with a catboy!

If you’re interested in the methodology used, here’s a link to the full study.

Essentially, they didn’t ask if the person thought they were a psychopath; They asked questions to which the answers reveal underlying character traits. Of course, no method of data collection is perfect. If you want to know what steps were taken to filter out insincere subjects, that information can also be found within the full study.