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A new book explores the disturbing stories of sexual encounters with aliens and UFOs.
Stories about these wild interactions have been around since the 1950s, and in The UFO Files, Nigel Watson explores digs into the psychology behind them.
In an interview with DailyMail.com, Mr Watson explores whether they stem from our subconscious or whether they form part of a longer tradition of supernatural encounters stretching back many centuries.
Nigel Watson is one of the authors of the UFO Files
But the book points out that many of these encounters were 'remembered' with the help of hypnotists, who may have planted the memories there.
Reports of encounters with supernatural entities are also much older than people realize.
Mr Watson said: 'Whatever the genesis of such reports, we have to consider that people have reported sexual contact with all manner of supernatural beings throughout history.
'Either the aliens have been conducting their beastly experiments for millennia, or such stories meet deep-seated socio-psychological needs.
'Until any solid medical evidence is obtained or any hybrid children turn-up, the latter hypothesis seems more likely.'
Antonio Villas Boas
One of the very first alien abduction stories, from Brazilian farmer Antonio Villas Boas, also involved a strong sexual element.
In October 1957, Boas was 'hauled aboard' a star-like UFO which landed in front of him, before being experimented on and covered in a mysterious gel.
One of the very first alien abduction stories, from Brazilian farmer Antonio Villas Boas, also involved a strong sexual element
Villas Boas, 23, was then seduced by a female 'alien' who was blonde-haired and blue-eyed and who he later claimed kept a sample of his sperm.
But he said, 'Some of the growls that came from her at certain times nearly spoiled everything, as they gave the disagreeable impression of lying with an animal.'
Researchers have since suggested that Villas Boas used details from previous Brazilian news stories and was a devotee of UFO author and alleged contactee Georges Adamski - but Villas Boas never recanted his story until his death in 1991.
Betty and Barney Hill
Antonio Villas Boas's story remained relatively low profile until the abduction and alleged sexual assault of Barney Hill made headlines around the world
Betty and Barney Hill's 1961 experience became the de facto 'first' alien-abduction story - with the couple encountering a strange light on a road in New Hampshire's White Mountains.
Betty and Barney Hill's 1961 experience became the de facto 'first' alien-abduction story
The couple couldn't remember some of the drive, and their watches had stopped working - but worse was in store for Barney.
He claimed that a cup-like device was placed over his genitals, before another cylindrical object was inserted into his anus - and in both cases 'samples' were taken.
Psychiatrist and hypnotist Benjamin Simon helped the couple to remember their experience - a Freudian, he suggested that it might indicate latent homosexuality.
Gabriella Versacci
In October 1973, Gabriella Versacci was driving around near the small village of Langford Budville near Somerset, England at 11pm.
Versace's car went dead, and she came out to investigate, before being pushed to the ground by a dark, metallic robot and fainting.
In October 1973, Gabriella Versacci was driving around near the small village of Langford Budville near Somerset, England
She woke up inside a circular room, naked and strapped to a table.
She claimed a male humanoid gazed at her 'without visible emotion', before pressing a pin like device against her and raping her.
She had a pregnancy test (it was negative) but her account was all her own, rather than being recounted under hypnosis.
Ed Duvall
Ed Duvall was hypnotised in 1986 by UFO researcher Budd Hopkins.
He reported on an abduction he 'remembered' in the early Sixties, where a violent attempt to take a sperm sample using a 'suction device' left him humiliated.
Duvall's experience came out under hypnosis by Budd Hopkins
Duvall said, 'They take what they want when they want it, regardless of anything. They don't seem to care how we feel.'
But later, he was approached by a female alien who, Duvall recalled, was 'well endowed, she definitely had mammaries.'
After intercourse, the grey aliens took a sperm sample which they kept in a bottle.
Pamela Stonebrooke
Los Angeles-based jazz singer Pamela Stonebrooke billed herself as the 'Intergalactic Diva' long before her alleged alien encounters.
She said of the moniker, 'Oddly, now, it kind of works.'
Pamela Stonebrooke, the 'Intergalactic Diva'
She has since described multiple sexual encounters with aliens - and with creatures who were seemingly alien-human hybrids.
She said, 'My first sexual encounter... was so intense and enjoyable.
'I awoke from my sleep to find myself making love to what appeared to be a Greek god.
'But the sex was very intense. The next time I opened my eyes he had transformed into a reptilian entity with scaly, snake-like skin. It was then I realised I was making love to a shape-shifting alien.'