This is potentially a massive topic for discussion. Many if not most notable actresses do a nude scene if not a full on sex scene during the careers, the list of whom do a decent "softcore porn" style lovemaking scene (what I like to think of as the "Red Shoe Diaries" scene) or anything harder is smaller, and the ones that are fairly big names when they do it is smaller still, not including the ones that become reasonably big names off the back of it, for instance Natasha Henstridge who became a star off the back of her shagging scenes in Species, got fucked on a sink by JCVD in Maximum Risk, then did more bonking in Species II and probably a raft of other crap films.
Demi Moore, Kate Winslet and Sharon Stone are all legends of simulated fucking. A pre tit-job Demi gets fucked passionately in About Last Night, and even though it was nipple-free I thought her (pivotal) scene with Michael Douglas in Disclosure was pretty hot, with panty-ripping and some nice dirty talk from Ms Moore. She really was my favourite actress back then. Winslet is always dead keen to whip them off, and if you think Shazza only ever had a wild ride in Basic Instinct (courtesy of that damn Douglas again) then you haven't seen enough of her work/tits. Speaking of Basic Instinct, Douglas gives Jeanne Tripplehorn (latterly of Waterworld) a good rogering as well. I'm shocked Kim Basinger's exploits in 9 1/2 Weeks haven't come up, or Elizabeth Berkeley transforming from "Jessie in Saved By The Bell" to full on wankmagnet in Showgirls. If you want to call her an actress, Madonna had an outstanding turn in Body Of Evidence. Denise Richards' wine-soaked tits in Wild Things was a fairly big deal at the time too.
Other favourites of mine, trying to limit to "sex" and not just "saw their tits" :
Jaime Pressly (best known now as Joy from My Name Is Earl) is magnificent in straight-to-video Poison Ivy: The New Seduction.
Pamela Anderson does brilliant "Red Shoe Diaries" scenes in Snapdragon, Raw Justice (a/k/a Good Cop Bad Cop) and best of all, Naked Souls, which is a must-see for fans of her tits.
Erika Eleniak gets her tittys sucked and simulated shagged in Chasers.
For Baywatch completionists, a pre-boob job Nicole Eggert received a good fuck in Blown Away also featuring the Coreys, Haim and Feldman.
Tiffani Thiessen did well keeping her nipples covered but her getting shagged in the tub in Sweet Dreams still gave me quite a boner.
I know it's already been mentioned but Halle Berry really gave it her all in Monsters Ball, didn't she?? Likewise the aforementioned Gina Gershon's bout of fingerbanging with Jennifer Tilly in Bound is one of the hottest things ever and even writing their names near each other gives me a tingle in my 'nads.
Angelina Jolie did simulated sex in a few scenes but I thought the fucking she had from Antonio Banderas in Original Sin was incredible. What a beauty that was.
For classic "pretty hardcore for Hollywood" Kathleen Turner was breathtaking in Body Heat, especially when gasping ".... don't.... stop....." during a bout of implied anal.
Those are my best answers, but there are loads of answers to "I got a boner seeing X getting fucked in such-and-such film" although it depends on who you consider an actress (as opposed to a titty model that happens to be doing a film) or a famous enough actress to mention, but names I'd be amiss in not mentioning would be Alyssa Milano, Shannon Doherty, Catherine Bell, Kari Wuhrer, Kelly Brook, Liz Hurley, Alex Kingston and Lucy Lawless, all of which have bared their jugs and been fucked in a film or on TV.
Demi Moore, Kate Winslet and Sharon Stone are all legends of simulated fucking. A pre tit-job Demi gets fucked passionately in About Last Night, and even though it was nipple-free I thought her (pivotal) scene with Michael Douglas in Disclosure was pretty hot, with panty-ripping and some nice dirty talk from Ms Moore. She really was my favourite actress back then. Winslet is always dead keen to whip them off, and if you think Shazza only ever had a wild ride in Basic Instinct (courtesy of that damn Douglas again) then you haven't seen enough of her work/tits. Speaking of Basic Instinct, Douglas gives Jeanne Tripplehorn (latterly of Waterworld) a good rogering as well. I'm shocked Kim Basinger's exploits in 9 1/2 Weeks haven't come up, or Elizabeth Berkeley transforming from "Jessie in Saved By The Bell" to full on wankmagnet in Showgirls. If you want to call her an actress, Madonna had an outstanding turn in Body Of Evidence. Denise Richards' wine-soaked tits in Wild Things was a fairly big deal at the time too.
Other favourites of mine, trying to limit to "sex" and not just "saw their tits" :
Jaime Pressly (best known now as Joy from My Name Is Earl) is magnificent in straight-to-video Poison Ivy: The New Seduction.
Pamela Anderson does brilliant "Red Shoe Diaries" scenes in Snapdragon, Raw Justice (a/k/a Good Cop Bad Cop) and best of all, Naked Souls, which is a must-see for fans of her tits.
Erika Eleniak gets her tittys sucked and simulated shagged in Chasers.
For Baywatch completionists, a pre-boob job Nicole Eggert received a good fuck in Blown Away also featuring the Coreys, Haim and Feldman.
Tiffani Thiessen did well keeping her nipples covered but her getting shagged in the tub in Sweet Dreams still gave me quite a boner.
I know it's already been mentioned but Halle Berry really gave it her all in Monsters Ball, didn't she?? Likewise the aforementioned Gina Gershon's bout of fingerbanging with Jennifer Tilly in Bound is one of the hottest things ever and even writing their names near each other gives me a tingle in my 'nads.
Angelina Jolie did simulated sex in a few scenes but I thought the fucking she had from Antonio Banderas in Original Sin was incredible. What a beauty that was.
For classic "pretty hardcore for Hollywood" Kathleen Turner was breathtaking in Body Heat, especially when gasping ".... don't.... stop....." during a bout of implied anal.
Those are my best answers, but there are loads of answers to "I got a boner seeing X getting fucked in such-and-such film" although it depends on who you consider an actress (as opposed to a titty model that happens to be doing a film) or a famous enough actress to mention, but names I'd be amiss in not mentioning would be Alyssa Milano, Shannon Doherty, Catherine Bell, Kari Wuhrer, Kelly Brook, Liz Hurley, Alex Kingston and Lucy Lawless, all of which have bared their jugs and been fucked in a film or on TV.