In the upcoming Easter plot, Cotton's character Sean Tully travels to London to see his son Dylan and reunites with former partner Marcus Dent (Charlie Condou), before moving to raise the 3-year-old together.
Speaking to New magazine, Cotton said: "It's two men pushing a buggy down a street - it's modern life. And if nothing else it will give people something to talk about.
"If there's one conversation about a young, gay man parenting in a positive way that's got to be a good thing."
The 35-year-old actor also rejected the idea that traditional viewers will be shocked by a same-sex family.
"It's a terribly old-fashioned view," he commented. "Gay people are the same as anybody else.
"As long as two people are happy and offer a child unconditional love, I don't see what the problem is." Get the Inside Soap magazine on your iPhone or iPad