Studies show that encountering materials with sexual content at an early age can have a rather negative impact.
A child processes information with sexual content differently to adults. It was formerly believed that a child simply does not understand sexual information and it does not have any impact, since children have a specific way of thinking and they do not have any skills of abstract thinking yet. (From the psychological viewpoint, up to the age of about 12, children have a specific way of thinking and they perceive everything directly and consider it to be real).
The latest studies show that despite the fact that children are not really capable of processing the sexual material they have seen, it may be preserved in their sub-consciousness and flash into their memory in the future