"How about PETA and I come to SeaWorld and videotape the process, and then people can decide how natural it is?" the New York Daily News quoted Lee as writing in the letter to the park. "It might make your dramatic news releases about a new orca pregnancy or birth less appealing, but the public deserves to know. They've undoubtedly never seen a sex tape like this," he wrote.
Lee first waged war against the theme park last week, when he claimed its main attraction, Tilikum the whale, was being kept in captivity to act as the 'chief sperm bank.'
"We know from SeaWorld's own director of safety (as well as videos on the web) that the way you get his sperm is by having someone get into the pool and masturbate him with a cow's vagina filled with hot water," Lee stated in a letter to the park.
A rep for SeaWorld quickly shot back, telling TMZ.com that the claims were 'beyond ludicrous' and PETA is as careless with their facts 'as they are extreme in their views.'
"The process of collecting semen for [artificial insemination] doesn't differ in any meaningful way from the techniques employed in managing livestock or other species for zoological display," the SeaWorld rep said.
Lee says that the theme park's explanation 'falls flat,' given statements he claims PETA has from their former employees. He cites an article by former SeaWorld scientist John Hall which details the graphic nature animal-care crews can take to breed the massive animals.
Lee also quoted Linda Simons, SeaWorld's former health and safety director, who confirmed to PETA that trainers are in the water when masturbating Tilikum. Tilikum made headlines earlier this year when he dragged a veteran trainer under water to her death as horrified onlookers watched. He is the oldest and largest killer whale in captivity and has been involved in the deaths of three people to date.