Keith Miller objected to Westbury Leigh Primary School in Wiltshire using the Living and Growing DVD on the basis it showed 'far too much to children at far too young an age'.
The Channel Four produced film has already come under fire from parents and government minister Nick Gibbs. It was removed from sale, but many schools still use it.
Mr Miller told his local paper that he believed 'sex education in schools is essential' and that he was 'not against it', but said it the 'important thing is the way it is done' and that the film's content was just not suitable for the age group it was going to be shown to.
"I wanted to see it for myself after hearing about the content, which I could have done, but was told I couldn't go along to a showing of the film to parents, which seemed very wrong to me," he said. "Unfortunately, I missed the session where the rest of the governors watched the tape, which is why I wanted to see it with the parents, so I could talk to them about it.
"Since they said 'no', I had to find out about the content of the film myself, being shown in a school where I was governor. There's something very wrong about that."
In one scene, the film depicts a naked cartoon couple chasing each other around a bedroom with a feather before making love, while another shows a drawing of a naked man and asks the viewers to name his body parts.
Mr Miller said all his co-governors approved the film being shown, and it was 'suggested' to him that he might like to abstain from the vote to air it.
"I objected and they went ahead anyway," he said, adding: "I couldn't agree with that. The film is too much, too soon."
Wiltshire Council said that while it did not 'recommend resources to schools' it did 'share details of those that are available' and that 'individual schools select the resources that they feel best meet the needs of the pupils.'
Some parents told the local paper that they too thought some parts of the film left them 'concerned'.
More on Parentdish: No sex please! We're at primary school
What do you think? Has your school used this particular DVD for sex ed? Do you think it is 'too much too soon'?