A South Australian state Liberal MP has been cautioned by the opposition leader for his use of social media after reposting salacious material on his public Instagram account.

Tim Whetstone says he was shocked to see the material – two videos, which 9News has chosen not to show in full – after he was made aware of it today.

The first video depicted a woman in minimal clothing on a boat navigating rough seas, while the second showed a woman shaping pottery in a sexually suggestive manner.

"I'm quite alarmed that that could happen ... it means I've got to be more careful," Whetstone told 9News.

"To be shown the posts, it really did shock me and is something I will have to pay more attention to," he added.

The MP said while he wasn't aware of the "repost" feature on Instagram, he admits

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