Because they have hot legs.
Cause crotch shots is all that keep the audience interested
It would just get in the way of their movements.
It just depends on the costume. Most couples have very stereotypical female and male dress. It's also easier for the lifts because there is less material in the way and the man can get a better grip. They do wear thick tights so their legs aren't completely bare.
Look deep into your soul and ask yourself if that is really what you want.
Don't know. Glad they don't though.
because nobody will watch them
So people will watch it.