These 20 Unbelievably Sexy Books Are Too Hot and Steamy to Miss

You knew "Outlander" was going to be on this list, didn't you? Diana Gabaldon's bestselling novel kicked off the lengthy saga of Claire Randall, a WWII-era nurse who is transported through ancient stones to 1740s Scotland. Determined but alone, she's reluctantly taken in by a Scottish clan, including Jamie Fraser, a handsome warrior. She and Jamie form an impossible-to-ignore connection, but she's still torn between the life she could have with him and the life she had in her own time.