On my bike, when it gets too hot the fan comes on and vents everything straight into your nuts. I've had legit 1st degree burns on my inner thighs from the tank getting so hot and I know people with the same bike who've had their fuel boil. I've also flirted with legitimate radiator boil-overs when stuck in heavy traffic on hot summer days.
High running temps are a known issue with my bike and some people put in pretty elaborate mods to tone it down.
But beyond just the hot bike, I sweat like anything as soon as the sun looks at me funny and hate anything over 27, 28 or so (and those are already bad). I've had heat stroke before just from sitting on the bike, in a 30+ day, in Toronto traffic for two hours.
EDIT: 1st, not 3rd. LIGHT burns (even though it's through jeans), not the inside of my legs being destroyed.