Addicted to YA discussion

I cannot figure out what the title of this dystopian book is. The book centers on characters who when they have sex their body parts turn purple and their children often die. Eventually the book goes through several generations and the population returns to normal. It has a blue title.

huh??

Ed wrote: "I cannot figure out what the title of this dystopian book is. The book centers on characters who when they have sex their body parts turn purple and their children often die. Eventually the book go..."

I tried to find it, but nothing comes up when I search for those details. Sorry!

sounds like a weird ah book 😂