My advice would be not to.
It creates a security risk and all actions logged on the account would look like they were conducted by yourself.
Best to keep your account details to yourself.
Security risk? Where is the risk? If for example my little brother scammed my account I would just go upstairs punch him and take his device.
I always felt the account sharing rule is pretty bs, if people want to share and take the risk of being scammed it should be an option, we haven't banned trades between toons because of the rates of scamming during trades have we?
Oderint Dum Metuant.