A Perth high school teacher has been counselled after posting naked pictures of himself on his personal blog.

Students at the northern suburbs high school came across the images on the teacher's blog, and then shared them via Facebook.

In one photo, his genitals were obscured by a leaf and in another, by a beer bottle.

The principal of the school alerted the Department of Education after being told of the blog by a parent.

After being counselled, the teacher removed the blog and expressed remorse for his actions.

There is no suggestion the man sent photographs directly to students.

The department says he will face no further disciplinary action.