"porn teens" returns plenty of results, and I doubt that they are all teens who are legally old enough.
One of the two word phrases that should not have had any matches that I tested was "porn isomorphisms". As expected, it gave me a lot of porn that had nothing to do with isomorphisms, and a small amount related to isomorphisms that had nothing to do with porn. All the porn involved women.
I then tried "porn homomorphisms", expecting similar results to "porn isomorphisms", except maybe the "homo" in there would lead to more male porn. To my surprise, there isn't any porn in the results! It's almost all math stuff, or word stuff.
Bing is weird.