Having seen the actual article in the Star now, it's clearly not something they are taking seriously.The actor said he likes the sound of it because it has comedy potential! I don't see anything comical about having a baby for the sake of it. And one line probably sums it up ...
'They fancy the idea of bringing up a child together ...'
They make it sound like a whim they just fancy indulging in at the time. What happens when the idea no longer appeals?!

Also he's picked jokey names, they toast the idea before they have sex ... there's just so many things about it that seems to say it's treated as a joke, and goes no further than Sean attempting to have sex with a woman, the effort which, according to the article, turns into 'a farce'
Presumably the joke is he doesn't manage it and thinks it's not worth the effort, or some such abrupt end to the storyline!
Anyway, it happens in January, apparently.