After God had rested on the 7th day, He went out on day 8 to bestow gifts to the creatures He'd created. He made his rounds and ended up at the Garden of Eden with a nearly empty bag.
God approached Adam and Eve and said, "I've been giving all my children gifts, but sadly, I only have two left". "One of them is the ability to pee standng up."
At hearing this Adam jumped up and pleaded, "Oh yes God, I want the ability to pee standing up. Please, please give me that. Gimme, gimme, gimme."
God was put out at Adam's display and lack of respect for Eve, but He sighed and granted Adam the ability to pee standing up.
He then looked at Eve and told her, "That leaves the last gift for you....multiple orgasams".