Have you ever considered a human having a sexual/romantic attraction to a humanoid but non homo sapiens sentient being? What would you label this person's sexuality? What if the alien species did not have genders/sexes, or had 1, 2, 3, 4, or more? Just a bit of a brain exercise. 
Suggestion:
Mate, have you seen the Scifi channel ? You see humans and aliens getting together everyday.
{ 4 comments… read them below or add one }
You would not be able to be sexually attracted to an alien. No alien would look even remotely like any other animal on earth. Wanting to have sex with an alien would be like wanted to have sex with human sized spider.
might be fun, I guess you'd be like captain jack harkness… Omnisexual
Well I had sex with some blue alien on Mass Effect, and she was awesome
It's like being a furry…
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