When I read this collection I see and feel the characters' pain and loneliness and feel not a speck of arousal regarding the scenarios depicted: relations with married men, older and old men, a surprising number of medical professionals, businessmen, masochists, doting lovers/clients, fathers and husbands. They are largely into S&M, mostly bottoms, not tops and it is sad, painful to hear it from the women's perspectives who seem so detached from the process of satisfying them.
Dominatrix, working girls, women in hopelessly one-sided relationships with married men, women with esteem issues, women with Daddy complexes, women who hint at pasts of incest or abuse - depressing and distressing. I don't want to castigate working girls but I would rather it was not positioned as a career option either lest someone interpret this as tacit approval of the shenanigans.
The problem with these roles although they might appear superficially empowering - these women are not shackled in unhappy marriages, no children encumber them perhaps, they have some autonomy, they literally, and figuratively, wielding the whip in the relationship with men - is that these advantages are ephemeral. Once your physical and sexual appeal diminishes you are relegated to the dust heap by men.
These women seem to be continually relegated to second or third place by men who must defer to wives, professions, children, or the insatiable need to try a "fresh girl" once the appeal of this one has worn off. The women in these stories (while sexually engaging their lovers or clients) openly long for a walk by the pier, a good glass of wine, to listen to poetry undisturbed, to be cherished as a wife, as a daughter. They don't seem to want sex. The ability to humiliate the client, yes. The ability to inflict pain, yes. Power, yes. Sexual pleasure, not so much.
She can write beautifully about terrible things. That is the artist's job. To write with passion and beauty and clarity about things which are, at times, terrifying to behold.
But I'm digressing a bit ... again I wonder, how much detail about sex is too much? I think the amount and quality of detail is important. Is this vehicle primarily written to get you off or to add texture to an intense, impassioned story? Is it clumsily and poorly written, cliche ridden? Is it boring - even explicit sexual content gets boring (porn anyone?). If it becomes any of these things - clumsy, cliched, boring or serves the god of Eros rather than the gods of literature then I would say it's too much.
If it engages the reader, arouses intense feeling, possesses beauty in the description, allows you to connect with the writer then I would say ... let a thousand orgiastic flowers bloom.