Here are the examples in that article, for those interested.

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In his 1837 autobiography, former slave Charles Ball describes meeting “the daughter of a wealthy planter, in one of the lower counties of Georgia” who had given birth to a mixed-race son. The family considered sending her out of state until the birth, but instead “the girl was kept in her father’s house, until the birth of her child, which she was not permitted to nurse; it being taken from her.” She was “degraded from her rank in society” and her child was sold into slavery.

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According to Captain Richard J. Hinton, an abolitionist commander in the Civil War, “I have never found a bright-looking colored man, whose confidences I have won… who has not told me of instances where he has been compelled, either by his mistress, or by white women of the same class, to have connection with them” (Hodes, pp. 130-131). One former slave told Hinton that his mistress ordered him to sleep with her after her husband died (Hodes, p. 131). These are just two examples of the many stories abolitionists like Hinton told to prove the immorality of slaveholding.

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In Incidents in the Life of a Slave Girl (1867), Jacobs mentions how planters’ daughters would take advantage of male slaves.

They know that the women slaves are subject to their father's authority in all things; and in some cases they exercise the same authority over the men slaves. I have myself seen the master of such a household whose head was bowed down in shame; for it was known in the neighborhood that his daughter had selected one of the meanest slaves on his plantation to be the father of his first grandchild. She did not make her advances to her equals, nor even to her father's more intelligent servants. She selected the most brutalized, over whom her authority could be exercised with less fear of exposure.