essentially it is when the woman is sitting on the edge of a kitchen counter, table, chair (or any other object) and the guy is standing in front of her and between her legs fucking her. basically the standing missionary with both male and female being erect only that the woman isn't actually standing, but her upper body is still upright.
http://xhamster.com/movies/420513/a..._gape_culo_takes_hard_cock_in_the_ass_al.html
http://www.porn.com/videos/she-s-having-a-nice-fuck-while-sitting-on-the-counter-298468.html
http://www.redtube.com/129735
http://www.xvideos.com/video368557/sweet_blonde_babe_gets_fucked_while_sitting_on_a_chair
http://www.spankwire.com/Charlie-Pool-Table-Suck-and-Fuck/video58736/
http://xhamster.com/movies/420513/a..._gape_culo_takes_hard_cock_in_the_ass_al.html
http://www.porn.com/videos/she-s-having-a-nice-fuck-while-sitting-on-the-counter-298468.html
http://www.redtube.com/129735
http://www.xvideos.com/video368557/sweet_blonde_babe_gets_fucked_while_sitting_on_a_chair
http://www.spankwire.com/Charlie-Pool-Table-Suck-and-Fuck/video58736/