Your puppy just sounds like he hasn't developed his bladder control yet. It's no big deal. He is wetting himself because he is too excited and can't hold his pee. As for the red christmas, again, it's an excited thing. There isn't anything sexual about it though. If you choose to neuter him, that will slowly stop being an issue. As he gets older, the piddles won't happen.
Pottie training the dog is the hardest part. But the dog could be perfectly pottie trained (having lost the desire to pee indoors), but it his bladder isn't strong enough, it's still going to happen as an accident. It will happen in time. As for the red christmas - neuter him.