Elf no Waka Okusama

Japanese Title: エルフの若奥様

English Title: The Elven Bride

Plot
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. The series explains the efforts they make to overcome this problem.