"Mansplaining!!" I just love that term. Sigh.....
I've read many articles about this subject & it's always split. The major issue is if a study is coming from a reliable source, the age bracket of the women & how exactly are they supposed to find out where this liquid comes from.....during sex.
I will not be volunteering for this study.
It's also the same arguement over a lubrication liquid that can be produced during back door sex. Some argue that's impossible & others say it happens all the time.

I do have it on very good authority that the porn industry tries to reproduce this effect by telling the women that can do this, to drink a ton of water. It makes for good video....if you're into that.