Before sex, hang a brightly colored pinata full of feces over the area you wish to climax in. Whilst climaxing, quickly punch the pinata open, and let the shit fall out onto you and your lover while you cum. Afterwards scream, "CRAFTY PINATA!".
You: Just the other night I pulled a crafty pinata with my bitch.. It was the bomb!
Friend: No way, dude! She let you??
You: She had no idea it was coming!