Under the Skin by Michel Faber
I can't say much about this novel, except that it's bizarre and creepy and brilliantly written. I don't want to give anything away, and it's better to read it without knowing too much, so don't Google it if you think you'd like to read it, but it begins with a woman driving around in the Highlands of Scotland, creepily picking up male hitchhikers, but only the ones with great bodies. After that, it just gets weirder. Also riveting. Maybe don't read it unless you have someone to discuss it with afterwards.
Warning: contains language, violence, creepiness, and not as much sex as you might think from the beginning.