Simply put; this is alien smut
Book 4 
 
"The ice planet has given me a second lease on life, so I'm thrilled to be here. Sure, there's no cheeseburgers, but I'm healthy and ready to be a productive member of the small tribe.What I didn't anticipate? That there'd be a savage stranger waiting nearby, watching me. And when he takes me captive, the unthinkable happens... I resonate to him. Resonance means mating, and children... but I don't know if this guy's ever been around anyone before. He's truly a barbarian in all ways, right down to clubbing me over the head and claiming me as his own.So why is it that I crave his touch and hunger for more?"