Accelerando: Datenshi-tachi no Sasayaki

Both have similar style and approach to hentai. They both are about seductive school girls that play submissive but have the upper hand in the end. 

Both anime themes are similar in a few ways. For example they have both sexually inexperienced/innocent characters being introduced in a world completely unknown for them by a certain professional figure. They both have above average animation and artwork. Accelerando is a manga adaptation while Ai no Katachi is a visual novel adaptation. 

Both anime based on hentai manga created Yuki Seto. In both series you can find very detailed sex scenes and naughty women who toy with men as they can't resist their sex appeal 

Very similar in the amount of steam and character attractiveness. There is also a similiarity in the creator's attempts at original storylines while throwing in lots of exhilirating scenes. Females are attractive and the males have inhuman stamina/capabilities.