I'd agree on the size, I ordered it from Amazon expecting a fairly thin book (seen as every one seems to have read all three in a short amount of time) but was surprised how chunky it was.
Again, can't say the sex scenes shocked me really. Compared to the sex scenes in American Psycho
they're very tame
For example, the chapter "girls"
If women in their 40s+ are indeed the main readers I guess I could see how they might find it a bit blush worthy, having not grown up with internet access and porn so easy to access like kids have nowadays