Presenting is when a character holds their body in a position that signifies that they're ready for sex with their partner. Often this means being bent over with their ass towards their partner, or lying on back with spread legs, labia, or butt.
Summed up by the phrase: "You want it? Come and get it!"
See take your pick for when multiple characters are presenting a choice, or presenting another for when a character presents another character's body.
