The Law-Nudes-Requests for Nudes

Is it against the law to ask for Nudes?

No.  In New Zealand, if someone is sharing (or is threatening to share) nude photos or intimate images of you without your permission, there are a number of laws they might be breaking BUT it is not against the law for someone to ask for nudes. 

It is the sharing that is the issue.

Is it against the law to send nudes?

No.  It is also not against the law to send nudes of yourself to someone who has asked for them BUT if you are under 16 and the person you are sending them to is 16 or over then they could be charged with having indecent images.