It does talk about Rosalie and Emmett ''making love'', where Emmett does say, '' do you know how many houses me and rose broke?''. But there isn't a scene with Rosalie and Emmett doing it.
Not in any of the books or in the movie. But they are married so they probally have.
It is not stated in any of the books, or the movie. But Emmett did hint at it in Breaking Dawn, he said to...
well, if you have heard Emmett telling Bella when she is a vampire, when they arm-wrestle, the bet was that if she won he would have to stop talking about her sex life, and if he won , he was going...
Rosalie and Emmett are married they marry once every few years because Rosalie loves the attention and loves honeymoons with Emmett. Read in all Twilight books they are soul mates!