Very few people actually fall into this category of attractiveness, and it is rare that one gets to see what another looks like as both a man AND a woman, but the word definitely does have practical uses.
"I thought Alex was just wearing skinny jeans but they're really girls jeans! That's unisexy!"
"Did you get that hoodie from american apparel? Because its so unisexy."
"Eww..a bathroom for men and women?! that is not unisexy.."