A Sydney man whose wife sent scores of sexually explicit pictures of their young daughters to a now-disgraced dance teacher says she must have been under the teacher's "manipulative spell" because "my wife has always acted in the best interests of the children".

The woman, who cannot be named, has admitted in court to sending the photographs for more than two years to renowned dance teacher Grant Davies, who allegedly told her the pictures made him "excited and horny".

Grant Davies with students from his RG Dance studio. Credit:Facebook

The court heard that Mr Davies, the co-director of the now defunct RG Dance at Chiswhick, requested the photos via text message and in person.

In response, she sent at least 100 explicit images which, the court heard, she carefully choreographed.