The whole business surrounding the creation of Peter Pan is screwed up too. In real life, the author had a brother who died very young. His mother would often call the surviving son by the dead son's name and made him (or he went along with the "game") of pretending to BE that son. When he wrote the play, Peter Pan became the boy who never dies.
The book he produced later is ... weird, to say the least. Some have surmised that Peter is fascinated by death as he can't die. It also appears that "boyhood" to Barrie meant "not understanding your actions have consequences" and that death was "a great adventure". It does say Peter "thins them out" when the Lost Boys get too old. Lost Boys also die during the battles and adventures Peter orchestrates. When their numbers get too low he steals more children, again, all boys. It's also said that he "trims them down" when they won't fit into his fort anymore.
The psychological implications of a boy who can't die who considers death to be an "adventure" and kidnaps and eventually kills other children is chilling when you think about it.
Wendy is the only girl and he brought her along to literally "be Mother" to himself and the kids. There's no romance, just Peter's need to have someone to look after him so he can have more free time to goof off.
It gets weirder.
The author of the book went on to befriend a family who have an infant named Peter. When the father of the family dies, he altered the mother's will so that HE would be seen as the children's guardian. Eventually the mother dies too and he takes over care of the kids. He considered this Peter to be the inspiration for Peter Pan, and there are stories he would take the kid on promotional gigs for this reason.
This kid, Peter Llewelyn Davies, would commit suicide in his 60s. While there were other factors that contributed to this, it should be noted he detested hearing about Peter Pan, the book or the play. Another of his siblings would die in an apparent suicide pact as well.
The whole thing is nuts.
EDIT: thank you very much, whoever send me gold. I didn't expect this to become the comment monster it did. Thank you all for making my day.