It depends on your belief and cultural background. Some people despise pornography because it’s explicitly forbidden by their religions, and others just don’t seem to care what people think about it.
However, as an adult or a responsible parent, you must set certain restrictions and rules on the use of the internet at home as exposure to obscene materials at a very young age may negatively affect your kids as they grow older. You may not be able to fully regulate the sexual needs of your kids– especially if they are teenagers– but, at least, you can guide them toward becoming sexually responsible.