The simple fact is, as long as there is social media more and more weird stuffs are going to become trendy. Sometimes ago it was the #fortheDi*kchallenge and #fortheP*ssychallenge well now its something else.
A Twitter user just started a trend for guys that encourages good personal hygiene in one hand and on the other hand sexualizes it in terms of the motive.
The male twitter user took to his page to show off his clean fingers, advising fellow men to make sure their hands are pu**y friendly like his own. This is of course important as no woman wants to deal with dirty hands during foreplay.
See the replies below.