The `Twilight` actor had to shoot raunchy scenes with co-star and real-life girlfriend Kristen Stewart in the next instalment of the vampire movie franchise and admits it wasn`t as glamorous as it looks.
Speaking at the Golden Globe awards in Los Angeles, he said: "It`s always awkward, in a way, doing it with anybody. But at the same time, it really depends on how it`s staged and stuff. It`s like doing Twister."
In `Twilight: Breaking Dawn` - which will is based on the fourth book and will be split into two movies - Robert`s character Edward Cullen sleeps with Kristen`s alter-ego Bella Swann for the first time and he has previously joked about how hardcore the sex scenes will be.
He said: "Bella becomes a vampire in this movie. We get married and sleep together. I haven`t read the script yet but I`m sure it`ll be good.
"I`m wondering how they will be able to translate this on screen. We`ll end up with an R-rated movie. Can you imagine if we decided to go in and turn `Twilight` into a hardcore saga for adults with sex scenes and everything?"