'There are a lot of people out there, for one reason or another, who have difficulty forming traditional relationships with other people,' he said.
'It’s really all about giving those people some level of companionship – or the illusion of companionship.'But Mc Mullen isn't the only person trying to achieve this - there are a variety of other sex dolls being created by others too.
'Our ultra realistic Android Love Dolls are hand made to perfection to create the most perfect human like silicone sex dolls ever,' the firm behind it says.'To make a human like silicone sex doll first we do a full body silicone lifecast on the model in order to make a perfect replica and ultrarealistic android love doll.
The figures are even fitted with a hinged jaw, with 'soft, stretchy lips, ultra soft tongue, soft silicone teeth.' While sex dolls had been produced in Japan since the 1980s, they were made from plastic.
However, Matt Mc Cullen, the CEO of Abyss Creations, the company behind Real Doll, created the dolls with a high-grade silicone, which retains heat and allows for a 'more realistic feel and greater elasticity', according to the company's website.
Douglas Hines, the founder of True Companion, created Roxxxy, a sex doll that Hines created following the loss of a close friend in the 9/11 attacks.
He was struggling to cope with losing his friend, and the thought of his friend's children not being able to know their father.