Fun with Nashiko

The author says,
"I wrote this story for men. They're gonna love it - it's super-nasty. Most women, other than the raunchiest among us, will probably think it's just gross. However, a couple of my gal-pals who read an advance copy thought it was one of the funniest stories they'd ever read. Go figure."
So. Is it nasty, funny, or both? Only one way to find out - read the book.