Why do boyfriends need to see ID cards and household registration books?

Why do boyfriends need to see ID cards and household registration books as follows:

There are several possibilities:

1. He wants to verify your identity and see your name, birthday and address. There are two possibilities for this situation. A wants to communicate with you seriously. Before you get serious, check your identity and make sure you have a bottom. B has doubts and doubts about you, doesn't trust you, or wants to verify your identity.

He wants to see your birthday, give you a surprise, or tell a fortune to see if you two are suitable. But: if he knows your birthday, it's not this, but he wants to see if you lied about your age, your age, or your name, age and home address.

I want to see your ID number. Use your ID number to find a way to check your check-in record. .......

4, want to secretly copy your ID card, take a copy, or do bad things, or become a sharp weapon when tearing B after breaking up, according to the address on the ID card, he can run to your home and threaten your family.