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- O'Hara K, O'Hara J. The effect of male circumcision on the sexual enjoyment of the female partner. BJU Int. 1 January 1999; 83 Suppl 1: 79-84. PMID. DOI. Retrieved 5 July 2021.
- O'Hara, Kristen / Jeffrey O'Hara (2000): Sex As Nature Intended It. Edition: 2nd. Hudson, MA: Turning Point Publications. Retrieved 5 July 2021.
- Official website. Retrieved 3 July 2021.