It has nothing to do with rays. It is with evry species that females suffer stress when kept with more males (including humans...). If you consider mass rape a good form of breeding ok, but i would like my animals to be stress free as much as possible. Beside that rays do nip on the females fins while mating. As said above, the females take alot of beating during that. In nature a female ray can escape. What can she do in a tank? stab the rapist to death?
So far no one posted to say the female gets killed or is under enormous stress.
Chill out . Lol
Don't mean to derail your thread Steve.

