Why is fixed better on wet?

Though I have found that if you are going down something steep (offroad) on a moutain bike using the rear to control your speed the back will lock up quite easily, so you end up feathering the front brake with your arse over the back wheel.

BTW I don't ride fixed (Yet).

I enjoy doing that but *with *the back wheel locked up, and let the bike skid over whatever rocks n crap in the way.

And why do you want to pull endo's?