What you call "insecure" is just a natural part of human social and biological norm when a man doesn't want to upbring somebodyelse's kids. Which can naturally happen,  if you "share".
The only human cultures that include sharing as their normal code are those who live in harsh conditions with a scarcity of available gene pool,  like the Inuit people,  for example,  for whom to offer their women to a stranger is a norm. That allows them to avoid inbreading.
But my incarnation of Zaton isn't afraid of inbreading