The following M/F book are science-fiction, or preferably, space operas with solid world-building, that feature a queer F/M romance with the male part being an alien.
The alien's instincts, culture and beliefs are well-defined and clearly different than that of a human male.

- The leading alien identifies either as a male, agender, or intersex with a male predominance.
- The less human-like the leading alien's mindset is, the better : for example, the Mass Effect main alien crew qualifies, but barely.

Menage and reverse harem only if all of the guys involved qualify.

Belong elsewhere:
- Aliens stuck in the archetyped human alpha male mindset, Human cyborgs, Human psychics
- Animal-human shifters, Furries, Space vampires, Space elves, AIs
- Female aliens, Intersex aliens with female predominance (such as the Asari, from the Mass Effect video game universe)