I just found an interesting article on platonic cuddling by anthropologist M. J. Coreil from January 2017:
The Power of Platonic Touch
A quote: "My experience in the touch community of Portland underscores two major challenges to legitimation of snuggling: the persistent association of peer touch generally, and snuggling in particular, with sexuality, and the pejorative image of people who attend snuggle events as psychosocially deficient in some way. I’ll address each of these in turn, then offer some ideas on what it may take to overcome these obstacles."