Kim Kardashian's 'American Horror Story' co-star Dominic Burgess felt "nervous" and "body-conscious" before filming their sex scenes.

The reality TV star has made her first foray into acting with a role in 'American Horror Story: Delicate' and her character Siobhan Corbyn is seen romping onscreen with a director named Hamish Moss - played by Dominic - and the actor has confessed he was worried about stripping off for his intimate scenes with Kim.

Dominic told Variety: "I was nervous and body-conscious, and to find out my first sex scene is going to be with an icon known for their beauty was a lot."

The sex scenes too a whole afternoon to shoot, but Dominic credits the on-set intimacy coordinator and the director - as well as Kim herself - with making him feel comfortable.

He added: "There was a great intimacy coordinator who asked what we felt comfortable with, and the director was John J. Gray, who I worked with on [TV series] ‘Feud’ — and Kim was wonderful. It ended up being a really pleasant experience."

Dominic confessed he's never actually seen an episode of any of Kim's reality shows, but he found her a delight to work with.

He went on: "She was really friendly. We talked about travel and Broadway shows and Shania Twain ...

"She worked so hard. Someone in her position could just go to their trailer and just come out when needed, but she was so present. She was asking questions, sharing ideas and being really open and engaging."

During this series of 'American Horror Story', Kim also locks lips onscreen with her co-star Emma Roberts - who plays an actress looked after by Kim's publicist character - and Emma revealed the scenes got a bit sticky because of her co-star's lip gloss.

During an appearance on 'The Tonight Show Starring Jimmy Fallon', Emma recalled: "We were laughing because we kissed, and they said cut, and Kim looked at me and started laughing.

"I was like what and I just had her gloss all over my face. And so we had to do major clean-up in between every take because she has the most perfect glossed lips, obviously, and it was everywhere."