I would put filters on it all.
However Tanya Byron wrote a guide about it this week in the Times and she said:
'If you allow your child to roam free online, it is your responsibility to talk to him or her about pornography Once you deem your children old enough to have internet filters removed, they have to be told what they may see. This means that you will need to have conversations with them about what they might see, which could unsettle them and which could make them feel uncomfortable.
As soon as you have talked to your children about sex, they should know about online sex. As a society we are very poor at having an open dialogue with our developing children about adult issues, particularly those relating to sex and pornography.
There is ample evidence that countries that have more open and honest dialogues with children and young people about difficult issues have fewer problems with sexual behaviour in their youth population.
The fundamental responsibility for this must lie with parents and educators. However many blocks and filters one imposes on children?s online behaviour, unless they have their own internal sense of understanding and responsibility, they and their digital-savvy friends will find ways to circumvent any blocks that are put in place.
The conversations around adult content extend beyond whether children should or shouldn?t see it. Crucially, they raise issues such as sex being a part of a relationship, and how pornography portrays sex.
Pornography can show sex in ways that may be demeaning to those involved, and unhealthy in terms of children thinking that such sexual behaviours are part and parcel of positive and healthy sexual development and positive and healthy sexual relationships.
There is no specific age at which you should have this conversation with your child, but as soon as your child is showing online digital independence and has no filters your child will see the content even when not choosing to seek it out. There are often social and emotional learning programmes at schools, or PSHE classes. These are important issues that must be debated, and the more they are sensibly discussed the less taboo they will seem, and frank discussion will become easier.
Adolescent boys will look at porn online' (she covers other areas too)
I always think that she has common sense and you will have to talk about it. You can block what you like at home but they will find a way around it if they want to.