Sci-fi romance that take place on uninhabited/sparsely populated planet OR uncharted planet.

1.
The Naked Alien (Exposed to the Elements, #1)
The Naked Alien (Exposed to the Elements, #1) 4.02 avg rating — 3,380 ratings
2.
Wulf (Mail-Order Brides of Crakair, #5)
Wulf (Mail-Order Brides of Crakair, #5)
by: Ava Ross
4.19 avg rating — 907 ratings
3.
Corsairs: Kaspar (Corsair Brothers, #2)
Corsairs: Kaspar (Corsair Brothers, #2) 4.13 avg rating — 5,031 ratings