Don't worry about excessive sweating. That's just natural for some people.
As long as you don't have excessive body-odor, don't fight it when you're in the gym.
However, in the office, that's another matter. Use anti-perspirant.
For some people, hair around the anus is normal and it can get quite messy back there.
Don't even think about using a razor back there.
Any nick or cut can easily get infected from all of the bacteria. Instead, hair removal for the anus can be done with hair removal creams (gentle...