Brightbird Espresso and boutique bar Lucy took to social media to encourage people to have their electoral details up to date and support marriage equality.

Bar owner Will Shepherd said he strongly supported marriage equality and he was happy to have his business back it.

“I can’t understand why it’s not already a thing,” he said. “It’s frustrating.”

He said he was concerned the postal vote could “fuel a fire” for homophobic attitudes.

“This is the 21^st century,” he said. “We shouldn’t really bat an eyelid. We don’t live in the ‘60s anymore where everything is behind closed doors.

“Love is love, isn’t it?

“I think it will go ahead… being a modern society.”

Brightbird Espresso owner Mark Brightwell said it was a no-brainer for his business to take a position publicly on same-sex marriage.

“It’s something we clearly support,” he said. “Why wouldn’t you?”

He said he was disappointed that marriage equality was being put to a vote but now was the chance for people to have their say.

The business support comes after Education Minister James Merlino wrote to every state primary and secondary school on Friday, requesting that they prepare to connect upset students to welfare staff and school nurses.

He also directed them to the controversial Safe Schools Program, Bully Stoppers and headspace.

"Sadly, there have already been reports of children and LGBTI families being targeted in hurtful campaign materials regarding marriage equality," he said.

"School staff need to be ready to provide affected students with wellbeing supports."

This week Melbourne Archbishop Denis Hart wrote to Catholics urging them to vote "on this vital public issue”.

He said it was important the church's "story" continued to be heard on important debates that shaped society, including marriage equality. 

“We understand that ours is not the only viewpoint in our diverse society… Yes, human rights are important. But so are human responsibilities. We are responsible for the impact of our decisions on future generations."