Whether you think you can or you think you can't either way you are right!
I don't mind admitting that I, too, have watched Hilton undergoing the sexual act. I phrase it as crudely as that because it was one of the least erotic such sequences I have ever seen. She seemed to know what was expected of her and to manifest some hard-won expertise, but I could almost have believed that she was drugged. At no point did her facial expression match even the simulacrum of lovemaking.
My advice to an aspiring actor would be to never stop learning or working for what you want. Nothing comes easy, ever, if you want something, you have to work for it. By working for it I mean work on your craft, learn from people who have something to teach. It's just like anything else, practice makes perfect.