Men's form risks near mountain biking?

I'm 20 and like mountain biking. Are there any risks for mountain biking that affect guys contained by particular? Any ways to prevent these risks?
Answers:    I can't see how the health risks of mountain biking would be any different for a guy or a girl. I can't even dream up of any risks (other than crashes) which would affect anybody who was healthy.
There aren't really tons health risks...a grizzly bear could charge you bad your bike though and eat you...but the chances of that arranged are remote. no, there are no health risks of that sort.

Just wear a helmet

wallow in