Tks!
Quite interesting study about the use of it at genitals : https://journals.lww.com/stdjournal/Fulltext/2000/02000/Effect_of_Chlorhexidine_on_Genital.4.aspx
i believe it's not a female only stuff because they used after sex in the drunk inanimate guy that was in the couch days ago. Believe it's some kind of liquid cleaning solution
The videos on how the procedure is
bandicam 2019-07-24 05-10-51-975.mp4
bandicam 2019-07-24 05-09-00-791.mp4
Now it depends if they know that
Could be to stimulate/hidrate the area, they usually fucks in rotating shifts (one coming to replace the other) for hours and hours - today and the other day in bedroom with the other guest female . They (the limp guy also) use a different one (and that one i believe is a desifectant) in the shower with a stick that insert inside the pussy..