Analytical computer-based tools such as BookLamp can be used to help correctly classify eBooks in an automated fashion. This could be useful to retailers given the recent “panic” regarding self-published erotica titles.
Interestingly, the tools suggest that nearly 30% of self-published content could be classified as erotica (although the survey was conducted on a relatively small sample, and may not be completely representative).
The psychology of ‘why’ this might be the case is not explored and would make a fascinating study.