Raunchy dating app matches couples by predicting the man's PENIS size using photos of his hands - as creator reveals how anatomical similarities can improve your sex life

The creator of a dating app that predicts the size of a man's penis using images of his hands has opened up about how she created the risque program. 

Triin Randloo, 40, had always been curious about whether the age-old theory that the size of a man's hands could determine the length of his appendage - a curiosity that ultimately led her to launch new dating site, SizeHim.

The handy tool works by scanning a photo of a woman's hand and matching it to a man who has similar proportions, with Triin explaining that experts suggest couples who have relative sizes will enjoy better sex together. 

While speaking to the New York Post, Triin revealed how SizeHim came to fruition.

At the time, she had been working on a project alongside a group of anatomists and physiotherapists when she admitted that she always asks potential dates for a photo of their hands before agreeing to meet up with them. 

The mastermind behind a penis size-predicting app has lifted the lid on how the tool works to guarantee passionate sex based on a man's hands

'They explained to me that hand proportions can tell what is in the pants and that when your body proportions are similar with your partner's, there's a higher probability that you will have a really good sex life,' she told the outlet. 

She claimed that couples who had greater sex were also most likely to stay together longer.

Triin and her team set out to prove their theory that similar proportions of the hands resulted in great sex, and soon enough, SizeHim was born. 

While speaking to The Sun, Triin explained that by asking to see a man's hands, you can 'speed up' the process of determining whether you have chemistry. 

However, she wanted to make it clear that it's just about the size of the hands. 

The founder noted that the proportions are what matter most to discover whether you will have passion underneath the sheets with someone. 

She also revealed that it was 'proven' with other body parts as well. 

The app uses finger length and 20 other measurements to create a profile that will leave you feeling like you just took a peek in your potential lover's pants. 

Triin Randloo, 40, had always been curious about whether the age-old theory that the size of a man's hands can determine how they perform under the sheets

The handy tool works by scanning a photo of your hand and matching it to a man who has similar proportions to you (Triin seen with her partner)

The site uses these calculations to tell you which one of seven penises you matched with.

The options are curved up banana/C-shape, bender, cucumber, big shaft, big head, mushroom or pencil, while also sharing some sex advice. 

Kirki Kubri, a sex specialist who worked on SizeHim, spoke to the New York Post about how your hands could reveal more than you think. 

'Our bodies vary inside and out, two partners are like a puzzle, so it helps a lot if body parts are clicking like they're made for each other,' Kirki said. 

According to the publication, one description of a penis who fell into the 'big head' category read: 'Get ready for earth-shattering sex!'

It also suggested that these lovers try 'The Crab' position when getting tangled up in bed sheets. 

The app takes even your most salacious imaginations to the next level by dishing out tips for the bedroom

The site uses these calculations to tell you which one of seven penises you matched with

The website, which has subscriptions starting at $3 a month, allows women to unveil Pandora's box and step into a world where they know exactly what a man is packing in between his legs. 

Based on the proportions of your hands as well as his, you will receive a compatibility score and sexual suggestions.

The app takes even your most risque imaginations to the next level by dishing out tips for the bedroom - including which positions will leave you and your partner deeply satisfied. 

SizeHim also poses two questions that are sure to get your heart racing. 

The site reads: 'There are two questions that unconsciously affect all of us: How much money? What is in the pants? 

'It is challenging for us to determine the size of one's bank account, but what we can tell you is what is in the pants,' it quips.