One day Adam and Eve notice God standing before them, holding a bag.
"Hi, God. What's in the bag?" Asked Eve.
"These are couple of things that i thought two would be interested in."
God rummages around in the bag a moment. "Okay who wants to be able standing up?"
Adam immediately puts his hand up in the air, waving frantically. "Me! Oh please, God let me have it! Just think if i could pee standing up! And it would help so much when i'm out hunting! Oh please! Let me have it!"
"Well alright," says God. "Now let me see what we have for you, Eve." God rummages about a bit more in the bag.
"Ah, right. Multiple orgasms"