Well it's not that the sex scenes are necessary, in those erotic thriller type movies, but even the actual plots aren't that good I find in movies that have those unnecessary gratuitous sex scenes.
But I think it's unfair to say, why bother to shoot a well done sex scene when there is internet porn. Movies like Basic Instinct, Body of Evidence, etc, have much better shot and directed sex scenes, that most porn on the internet is, in terms of quality.
That's like why bother to watch a movie like Mad Max: Fury Road, when you can just watch any car chase captured on the news. Because Mad Max: Fury Road does it a lot better than some amateur camera people, just like how Hollywood can do sex better than some amateur internet porn filmmakers.
But I think it's unfair to say, why bother to shoot a well done sex scene when there is internet porn. Movies like Basic Instinct, Body of Evidence, etc, have much better shot and directed sex scenes, that most porn on the internet is, in terms of quality.
That's like why bother to watch a movie like Mad Max: Fury Road, when you can just watch any car chase captured on the news. Because Mad Max: Fury Road does it a lot better than some amateur camera people, just like how Hollywood can do sex better than some amateur internet porn filmmakers.