The actress - who plays Liz Sherman in superhero sequel 'Hellboy II: The Golden Army' opposite Ron as the eponymous hero - loved the romantic scenes which saw her locking lips with Ron's plastic and make-up covered face.
She said: "The first time I had to do a scene like that with Ron I did not know if I could touch him, if it would ruin the make-up. I had never worked with a prosthetic love interest before. So I did not know how I would touch him, if it would make a sound, if it would sound like a balloon. I had no idea.
But after that it felt completely natural and normal and I completely forgot that I was talking to a man in make-up. It felt completely real. I actually really enjoyed it."
Selma also admitted that she founds some scenes more difficult to shoot than her co-stars because she was the only character to "have a face".
She explained: "I didn't realise I was the only human until we were halfway through the movie and I was like, 'Wait a minute - I'm the only face here!'
And I'm like, 'Where are you guys looking?' And everyone else says, 'Oh, it doesn't matter - no one can see our eyes.' And I said, 'Oh, my God, everyone can see my eyes, it really matters where I'm looking, what I'm doing, I have a face, I have a face ..." There was a moment of terror, like "Oh my God, I'm going to c**p all over this movie - I'm going to be the mess.' "
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Gallery: Hellboy II: The Golden Army
