Cape Town - Viola Davis injured her back filming a sex scene. The 50-year-old actress admits she was "totally committed" to a raunchy sequence with her How To Get Away With Murder co-star Billy Brown but was left in agony by the shoot. Though Viola - who plays ruthless lawyer Annalise Keating in the TV series - admits she had to ask producers to "slow down" on the sex scenes for the forseeable future, she is expecting writer Shonda Rhimes to bring them back quite soon.