Ejaculation worry: Not Semen-Please Help!

Well, my partner and I like to do things now and again, and since things became more sexual, everytime I've seem him climax, the fluid released does not seem to be semen, but urine. sometimes it's very little and I think it's almost like water, and the last time it was a lot, like he was urinating, and it smelt like urine too.

Please give me help on this. I am not sure if this is soemthing normal guys can have or if this is something serious. I am rather worried. Please Help.

[Dranix]

Any one? :(