Factors that break ghusal

Masturbation

Q: After urinating, when rinsing the private area with a hand shower, the pressure of the water is satisfying. Sometimes, I get really aroused, which follows a discharge. Is this counted as masturbation? Do I have to perform ghusl? 

Semen coming out after ghusal

Q: I woke up after having a wet dream. I immediately made Ghusl and then remained awake for sometime during which I performed Salaat. I then urinated. A sticky, semen-like fluid came out with the urine. The urine was also very cloudy indicting the possible presence of semen therein. I therefore made Ghusl again.

1. Was it necessary for me to make Ghusl again after observing this about the urine?

2. Was the Salaat valid?