This is something may have popped up in the mind of Star Wars fans who were captivated by the sight of scantily clad Twileks, and Ahsoka Tano's navel.
Sorry for coming off as a pervert or creep, but what would your stance be on humans having sex with non-human sentient aliens? No, I'm not talking about sleeping with a Xenomorph because on their world they're considered animals anyway.
I'm speaking of course of the possibility that whenever we run into a race of non-human sapients (like the Vulcans or Twileks), and somehow love or lust develops between us and them, what should we do if either party wants to have sex with the other? There are some social and moral factors involved I'm sure, but I would like to hear from other people on this matter first.