Berrr's Vow - Laurann Dohner First thing first, this is pure erotica, so the plot device is based on sex. The alien's female can't handle sex like a female human and fun ensues. How the species has lasted this long I have no idea. I am pretty sure the readers are not supposed to notice that.That being said, the book is decently written and I enjoyed their dialogue. I enjoyed the culture shock aspect and the female lead is kick ass. However, if you are looking for plot, then I recommend her New Species series.