Because the Bible is just a long dramatic novel/comic, depicting a man with superpowers.
Jesus was no different to Dr. Manhattan.
Jesus is akin to Superman. He is the poster boy of the man-made comic known as the Bible.
Only difference is he has a different powerset. (Superman can use HV, ice breath, etc. : Jesus can multiply food, walk on water, etc.)
Do you usually use a condom when engaging in sex?