<strong>WATCH ABOVE: A 17-year-old who had his photo snapped in a bathroom stall at Fairview may have blown the lid off a sex ring operating in the Pointe-Claire mall. <a href="https://twitter.com/rachel_lau" target="_blank">Rachel Lau</a> has more.</strong> MONTREAL -- It seems like just innocent graffiti, the kind that can be found in almost every public bathroom. But take a closer look, and the writing is actually the first step to an underground culture that trades sex. [caption id="attachment_1556975" align="alignnone" width="720"]<a href="http://globalnews.ca/wp-content/uploads/2014/09/tap.jpeg"><img class="size-full wp-image-1556975" src="http://globalnews.ca/wp-content/uploads/2014/09/tap.jpeg" alt="A glimpse of the writing on a bathroom stall in the Sears at Fairview Pointe-Claire mall in Montreal. " width="720" height="405" /></a> A glimpse of the writing on a bathroom stall in the Sears at Fairview Pointe-Claire mall in Montreal.[/caption] "In a bathroom, in a public place, a semi-public place, you might get caught, you might not," said James Pfaus, a sexual behaviour professor at Concordia University. <blockquote><strong>"You're on the edge and that edge then makes the sexual gratification all the greater."</strong></blockquote> Instructions on what to do are written in plain sight. <strong>READ MORE:</strong> <a href="http://globalnews.ca/news/1553804/alleged-victim-of-a-fairview-pointe-claire-peeping-tom-speaks-out/" target="_blank">Alleged victim of a Fairview Pointe-Claire Peeping Tom speaks out</a> "Once you've made eye contact, once you've smiled, then people might just go somewhere else," explained Roberto Ortiz, a gay rights activist with Rezo-Sante. "The other person follows, so that there's the 'I'm leaving, but I'm actually inviting you to follow me.'" The messages are essentially instructions, and will ultimately lead people to a website called squirt.org. It lists public places across the city of Montreal where men can meet for a casual sexual encounter. "We do like to inform people of the different things that they have to think about," said Ortiz. <blockquote><strong>"In the end, it's a personal decision that every man makes."</strong></blockquote> Some of the places listed on the website include universities, gyms, public parks and many malls, including Fairview Pointe-Claire. <strong>Watch: Teen speaks out about encounter in Fairview Pointe-Claire bathroom</strong> [tp_video id=1554349] Matthew Tod, a 17-year-old boy from Pierrefonds said he believes he was sexually assaulted on a trip to the Sears bathroom at the mall last week. <blockquote><strong>"He went into the second stall, pulled out a phone and took a photo of me." </strong></blockquote> "By the time I got out, he had already left," Tod told Global News. Global News spoke to security at the Fairview Pointe-Claire mall. They said they were not aware the mall was a hook-up hotspot and now will let the police investigate. The website's owner sent Global News a written statement, which read: <p style="padding-left:30px;"><em>"Our site is for adults and we are very vigilant about making the age restrictions clear.</em></p> <p style="padding-left:30px;"><em>We put alerts on the location and email our users in the region to encourage them to be safe and responsible."</em></p> However, the incident has raised questions about safety and the risks involved when strangers approach teens in public bathrooms. [polldaddy poll=8299671]