i used to but i don't really care anymore. i have a pair of leggings and I've only worn them out in public maybe 3 times. i always wear them with a long shirt or flannel. they're super comfy but i'm too nervous that my underwear is showing or something. haha thats so embarrassing to me. i usually will wear them at home to be comfortable.
First question: yes. Leggings are leggings. Pants are pants. Second question: yes, I don't care. Third question: I suppose they could be hot, if they were in a fire or a dryer. Fourth question: I suppose they look questionable.
It can look hot, BUT! there are way too many women out there that should NOT be wearing them. I mean what happened to a good pair of jeans? Nah I'll just go with jazzercize attire out in public, it's just as classy... (said nobody)