A lot of people knock this video, claiming it's one of the worst experiences you could have next to being water-boarded.
I completely disagree.
Yes, the animation is not up to otaku standards, but then again, if you're even considering this, you're probably not true otaku anyways.
Yes, it's incredibly bizarre, but in a cartoony Mad-Magazine-by-way-of-Penthouse kinda way. And that's not a bad thing.
Yes, the dialog is incredibly bad, but that's the entire point. It's just like a porno, just animated. Besides, how many movies do you get where the Doctor threatens to put something (remember, it's a hentai video, so you can guess what it was) into a patient's mouth, only to be reminded by his nurse that he already did that? Or the Doctor's landlord demanding he live up to his sex-for-rent arrangement and pay all 61 days in arrears in one night--and subsequently offering him the opportunity to pay the next month's "rent" in advance? Or a non-orgasmic patient lamenting that the only sexual practices left for her are those that are "legally prohibited?"
The sight gags alone are worth the price of admission. The Doctor crying and hugging his penis (which is also crying) when he can't get it up. Nurse Tatase braying like a horse, followed by a real horse with the Doctor's voice in a porno version of "Freaky Friday." A graphic illustration of the nurse's technique for bringing a patient to orgasm for the first time. The same patient finally achieving orgasm and yelling "Japanese Fireman"! (You have to know a little bit about Japanese firemen to get that last sight gag.) And my personal favorite, the Doctor and his nurse trying to help the aforementioned non-orgasmic patient using increasingly bizarre methods (including some of the previously mentioned "legally prohibited" practices, here wisely "censored.")
So, in short, I highly recommend "Ogenki Clinic Adventures." Just be aware that this is not a realistic depiction of sex.