Peeing on the bike question
I have peed in 2 races successfully. I will tell how I did it but I have a question as to technique differences. Both were HIM and in places where there weren't many spectators. I made sure that I had a good head of steam so that I could coast a bit (preferably with a down gradient which is much better than flat to maintain forward motion). As I am a dude, I looked around then whipped it out and began to pee. The hardest part was to get started but once I did, it was over in 30s. If you don't get enough speed you are at serious risk of slowing down too much which also happened to me. Stopping mid-flow causes a fair amount of discomfort and pressure so make sure you go fast enough.
That's how I did it, but for IM there are a zillion peeps around. For those who have done it in an IM do you just pee through your shorts and rinse with water afterwards. I figure that I can save upwards of 5-10 minutes if I pee on the bike as I won't have to stop and wait at the port-a-potties which can develop a bit of a line.
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And then rinse liberally....which also serves to cool me down.