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...
there are two main variations of a DP
#1 'Cowgirl DP' - girl's back turned to guy on top fucking her ass and front turned to guy on bottom fucking her pussy -
#2 'Reverse Cowgirl DP' - girl's back turned to guy on bottom fucking her ass and front turned to guy on top fucking her pussy...