Okay, I am a complete noob in this section, I read a little on link development but i still need help. First of all, I own a hentai website and I have posted on some forums, commented on some blogs (nofollow). What else can I do ?
Your best bet is to post interesting things, maybe start a blog that people may find interesting and post on their site. Content that interests people is big. If people are not interested they wont come, and they surely wont post a link back to your site.
Contact to the website owners through e-mails and ask them to put your link on their websites. It will be helpful