A cuddle whore who refuses to take "no" for an answer; a person who insists on hugging/cuddling people, no matter how uncomfortable or embarrassed their target feels.
Debbie got dumped by her boyfriend because he considered her a cuddle rapist.
Someone who, when sharing a bed with another, forces cuddling. Often times this is done subconsciously, however some cuddle rapists claim to have been asleep when they actually were not.
Jane: I invited Susie to our sleepover.
Annie: WHAT!? She is a total cuddle rapist! The last time I stayed with her, we ended up spooning all night.