Elf no Wakaokusama
English name: The Elven Bride
Genres: Fantasy, Hentai
Type: OVA, Episodes: 2
Aired: Jul 25, 1995 to Oct 27, 1995
Studio: AIC
Source: Unknown
Rating: Rx - Hentai
Synopsis:
Mixed marriages are a tricky thing, so when the human Kenji and Milfa, an elf, get married, the course of true love does not run smoothly... especially when it turns out that there’s a certain difference in plumbing that makes it almost impossible for them to consummate their marriage. 

(Source: ANN)