I took this picture of my new rat, Daddy, when he was playing on my bed yesterday. I recently rescued him from disgusting cage conditions. He is such a sweet boy. I plan on getting him fixed and then keeping him with my two females.
Its too bad you can't spay the Ladies and leave the Gentlemans jewels intact. Spaying females greatly increases their chances of avoiding tumors, neutering an adult Male does absolutely nothing positive for them.
Only neutering a male under 6 weeks old has been proven to increase their lifespan by a considerable amount, but removing the testes of a young animal before they drop means they must operate through the stomach, very risky.