I would love the ability to stop my students from using the "Spanish flirting" bonus feature.
With all of the educator requests to allow teachers to disable the flirting bonus, I can't understand why Duolingo has not acted on this!
Probably because there are hundreds of requests each supported by thousands of users.
I'd try to tell them to not use it and that if you pick them using it they'll lose XX points on their final grade. It should prevent most of them from using it.