Try some of the TeensforCash series vids, there's an old dude in there who almost loses control when he busts his nut on the sluts.
couple of examples: http://xhamster.com/movies/3875501/teens_for_cash_kiki.html
and
http://xhamster.com/movies/1251160/teens_for_cash_13_soma_hernandez.html
Not...