@wayjii as far as i know
same-sex partner visa is OK.
As long as you provide documents to prove your claim, like propertie & bank account together, if you have lived under the same roof is more helpful, docs to prove travels together, reliable persons to confirm your relationship.
this is on top of the other basic requirements. australia is an open country, i know a lot who had this same case and got grants.
all the best sa inyo