The soap actress filmed steamy scenes as her character Theresa McQueen for the late-night edition of the Channel 4 soap, alongside co-star Andrew Still.
Porter revealed that her mother banned her from showing her breasts on screen during the scenes.
"I told my mum what I was going to be doing and she said, 'You do what you think is necessary, but at the end of the day don't get your nipples out!' I've seen the pictures from the really rudey bits and they're quite shocking," she told The Sun.
"I think my grandma might need a cup of coffee at that point. We might have to take her out of the room, get her a cup and bring her back when it's finished!"
Porter revealed that she was highly nervous about filming the scenes, saying: "I don't think you can ever get psyched up for something like that, ever. We'd been prepping for it the whole time, knowing it was coming up, but when we were told it was happening that day we were really shocked and nervous.
"And as we were about to start shooting, I went, 'S**t, this is a sex scene! Oh my God!'
"But at the end of the day it's not me who's doing that, that's not my real boyfriend and you just have to get over the shock and get on with it. You take your robe off, quickly get into position and just try to quickly go through the motions while being very professional!"
The former Dancing on Ice contestant added: "I didn't have anything on, but Andrew had a modesty sock with a bobble on it.
"I don't think I've ever seen anything like that before, put into a sock - that was a strange one!"
Porter recently said that Hollyoaks Later will show Theresa's bad side.
Hollyoaks Later kicks off tonight (September 17) at 10pm on E4, and continues every night this week until Friday.
Photo gallery - 'Hollyoaks Later' preview pictures:
Copyright: Lime Pictures