I think the phrase 'good erotic thrillers' is a bit of an oxymoron as the vast majority are dreadful. Channel 5 used to show them every Friday but appear to have cleared up their act recently.
The 10 basic ingredients for a C-grade erotic thriller:
1. It will star a Shannon; either Tweed or Whirry. Or possibly Rochelle Swanson. On the male casting front, they may have managed to snag a relative of someone reasonably famous or someone who was once tipped to be the next big thing (Chad Mcqueen, Eric Roberts, Maxwell Caulfield )
2. The same piece of horrendous music will play throughout all sex scenes.
3. The lead actress will have a long lingering shower/bath scene which will forward the plot exponentially. The lead actor will have either a dodgy haircut or bad facial hair. Or both.
4. The title will riff on other more successful films. "Indecent instinct", "Basic Exposure", "Animal Desires". Stick a Roman numeral or number in there for effect, even if it shares nothing with other films in the 'series'.
5. To explain the incessant sex scenes, the story will take place in either a brothel, a strip club or a sex therapist's office.
6. The female protagonist, despite being straight, will indulge in a bout of lesbianism at around the hour mark. She will then have sex with a man to restore balance to the erotic thriller universe.
7. The sex scenes will be spread over 15 minute intervals. However, this goes out of the window towarRAB the finale where, in a half-arsed attempt at shoehorning in a plot, it gets rather dramatic and people get shot.
8. There will be a couple of 'filler' sex scenes featuring characters who have nothing to do with the other characters.
9. At some point in the film, the protagonist will observe another couple having sex. It's an ironic statement on the nature of voyeurism. Or something.
10. The credits will roll and you will feel slightly sordid, probably bored and most definitely frustrated.