An excellent and very educational series. About a newlywed couple who are virgins and their comedic ups and downs in learning how to have sex. Not really a hentai, though there are scenes which can be called hentai. Tastefully rendered taboo themes. A funny "how to" guide for sex illiterate and experts. (Source: MU)
Background
Futari Ecchi was partially published in English as Manga Sutra by Tokyopop, who published four volumes from January 8, 2008 to January 13, 2009.