First video is totally fake.. not even the right consistency, and the second one is real. That guy is on a few threads.
As for injecting fluid into your bladder for a video, you couldn't be more wrong, people are stupid enough to do ANYTHING for ANY reason. Especially if it makes them look like a more virile man to thousands of strangers.
If you want more information, feel free to check out my thread about it:
Fianally a real explaination of the ridiculous cumshot