There are probably more complete sets (even preview) than this Bravo link, but it turned up first
http://www.bravoerotica.com/femjoy/kinga-and-nicolette/girls-and-a-ladder/
http://www.yourlust.com/galleries/femjoy/8d1ea4/index.shtmlI must say JC, one of the more unusual ideas for a theme ever!
I wonder if it started by chance years ago in some studio as a photog was looking for ideas
Here's a brief video of Claudia Schiffer (non-nude) against a ladder--pretending to enjoy a Baldwin brother
http://www.vidilife.com/video_play_1064208_Claudia_Schiffer_Sex_Scene_On_A_Ladder_In_Pursuit.htm?intMediaProgramID=1064208&play_action=bestofchannel