Tight pants are sexy - they show off a females butt shape & crack depth better than loose baggy type pants / jeans. Some women aren't lucky enough to have feminine looking figures that even jeans can't show to their advantages. Might be tight one place & baggy in others.
Those yoga pants are super soft with a gentle cling. They are comfortable. I don't wear mine anywhere but home but I'd wear them in the gym if I went to one.
Tight pants up the crotch of a female, are so sexy if the wearer is nicely shaped to fill them. Shows every curve good & bad.
I like tight pants on guys. I grew up in a small redneck town where most of the guys wore tight wrangler jeans, and was it great to look at those cute male butts.