Is there a way to have divas fight superstars in WWE 14 online?

not sure about that, but the game has it built in were Diva's cannot fight Male wrestlers at all... so the online thing may be some kind of glitch that is done to have it were you can fight..

Content Group #2 – WWE Superstars and Moves Pack:

WWE Superstars: Fandango and Big E Langston;

WWE Divas: Brie Bella, Nikki Bella and Summer Rae;

Moves Pack: More than 30 new moves and taunts, including the Black Widow (made popular by AJ Lee) and the Koji Clutch (made popular by CM Punk):

WWE Superstars and Divas, along with the Moves Pack, will be available for a suggested purchase cost of $7.99;

Summer Rae will be available free of charge;

All content is currently scheduled for worldwide release in December 2013.

This restriction is completely nuts. And that goes double with this game's ref.

The Ref is just nuts with the DQs for "hitting divas". I mean, the Ref will ring the bell because your MANAGER hit a diva. At least throw the manager out and let the fight continue. But no, we can't have evil superstars punching poor defenseless divas,
can we?

This rule needs to be DQed.

but this game was already over halfway done by THQ before 2K took it over, we wont get a full 2K game till this years.... and were have they said the DLC will stop on the 27 of Feb cause on their own website it says the last DLC was in Jan, there is nothing
left. If they were to do any more DLC, it would be legends and superstars, not diva's

wwe.2k.com/.../us-downloadable-content-in-wwe-2k14

They should have Diva vs Superstar matches in the games. After all, they're only games.