It doesn't really make a difference to me. Actually, my two most favourite places to be with my period are in the shower and on a horse. I have no idea why, but I much prefer it than sitting on the couch.
I got it once at pony club *grimace* so embarrassing. Extremely lucky I took another pair of joddies with me, I never take spare pairs. I just took them because it was raining. My saddle was a teensy bit yuck, but it's synthetic (thank god!) so it washed out. Phew!
Oh and it's part of the rules that we have to wear cream coloured joddies. NOT cool
Eventing, the sport where you strap your medical information to your arm.