Someone ask to me as a security engineer.

Bro : what do you think about most secure way to authenticate, i read news using fingerprint no longer safe?
Me : yes they can clone your fingerprint if you take a photo with your fingerprint to camera.
Bro : so what is the other way to authenticate more secure and other people can't see in picture ?
Me : D*ck authentication is more secure now, other people can't see your d*ck pattern right?