No. The fluid you see, semen, could have lots of sperm in it, few, or none. The sperm could be healthy or unhealthy. Doctors can do various tests to determine sperm count (how many there are) and sperm motility (how much they're moving, which is a good sign of health).
Both.It really doesnt matter sperm is sperm nomatter how you look at it
If sperm is the content of a semen, then thick or watery, both have the same effect.