Prompt the Muse #34 - Speculative Writing Prompt

Photo: Two Aliens

Two of your characters have entered into an unconventional romance.  There are at least three issues that make the relationship unusual within their cultures.  What are the three issues?  Do you think your characters will remain together, or will these issues create a permanent division between them?  Write your ideas in 200 words.

Photo: Science Fiction Museum Restroom Signage, marcin wichary on flickr via Creative Commons, CC 2.0