Definition : Hentai is Japanese word meaning "change of form", anormality" and "metamorphosis". However, in slang it means "perverted" and later it has been used in many other countries to refer to all those anime, manga or games with sex contents or just porn.
This aspect of the Japanese culture has been more and more popular in the West thanks, in a great degree, to Internet and Mobile Internet (WAP). Even though in the Western some porn comics and animations can be found, they have never been so popular as hentai manga is now.
Animation artists focus that on the daring female characters with big tits and a emphasized silhouettes, usually use their talent to big comic companies and not to works aimed to the adult market. They even be afraid of being ridiculous working on adult titles not so well-known. On the contrary, in Japan there's a great number of talented mangakas who draw Hentai porn.
Compared with other forms of pornography, Hentai porn uses to depict women as normal people who end in some kind of sexual encouner that arouses them to a point of no return. The characters are usually depict as shy persons who doesn't have conscient thoughts about sex until they found themselves in an exciting and arousing situation.