30-sai no Hoken Taiiku

Similarities: Both main leads wanted to get laid. Both have comedy and ecchi as the main genres. Both main leads have deities as their sex guru. Dissimilarities: One is a full 12 episode anime while the other is a 12 min Omake. One has an extra school genre, while the other has sienen genre. In B Gata H Kei the deity merely a imaginary being, while in 30-Sai the deity messes up the lead character's daily life. Also, in B Gata H Kei, the main lead was able to kissed, show her privates ( accidentally of course) and nearly banged her male lead, while in 30-Sai, the main lead is yet to kiss and have his cherries popped by the female lead he is targeting, provided that his deity doesn't mess things up. And, another thing, B Gata H Kei is a bad anime, but not so bad, while 30-Sai is a bad, bad and lame, lame omake.  read more 

The story is about a same, the main character just want have a H-scene with someone he/she loves, and they have a god of love (H-scene) on their side. Being same story but its not at same enjoyable story. I thought you guys just see it. By the way, its another fun to see a human who's searching the meaning of love :D hmph...looks like I should be a preacher right now hahaha... Enjoy it guys (: 

Both anime are about trying to lose their virginity they both have comedy and ecchi but one is a 12 min omake while the other is full 24 min also one has a extra school genre 

Comedic anime with the protagonist trying to lose their virginity. B-gata H-kei differs with its high school setting and dynamics of character rivalry. While 30-sai no Hoken Taiiku is a compilation of short 10 min episode, with adult characters and the dynamic of a love god attempting to help its protagonist lose their virginity. 

Both are a comedy about a virgin in the quest to have sex for the first time 

Both are based on "educational" works who tries to give sexuals lessons to those who ... Oh, lame excuse to sell. The animated adaptations follows a charismatic, inexperienced and shy couple: in "30-sai" they are still trying to get together, with the help of their clumsy god friends; meanwhile, "Futari Ecchi" starts by the marriage, but its protagonists are equally or even more naive and lost. Different environments, similar situations. The two recount with pleasant mood the difficulties and the steps that these couples give in direction to love, in a way that does not abandon its "didactic" origin. "Futari Ecchi" stands out for having a more mature story, while "30-sai" constantly loses himself in questionable and embarrassing scenes. read more 

Both are ecchi comedies about middle-age couples trying to improve their intimate life. 

Both shows deal with old adults who've had little experience in love, starting to learn about romance and sex. They both also offer some sexual education value (and are both wholesome romances if you're looking for that)  

Two educational anime, one dealing with romantic relationships and the other with various diseases. For both, the episodes are pretty short and the different tips are often represented in diagrams. They are also similar in the comedy theme with some dirty and absurd humor. 

Both are able to create laugh using sexual innuendo. Both main character are loveable. 

Both are anime that is supposed to be somehow educational (sports, sex-ed) but turns into anime with lot of echi parts. 30-sai no Hoken Taiiku is more comedy.