Business Insider obtained a PDF guide that is sold online for just £2.59.

It details how scammers operate fake dating site profiles in order to con men out of money.

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After four years, scads of lays, and many great girlfriends (plus plenty of failures along the way), he launched this website.

If it wasn’t for online dating, most of my generation would be single.

It's pretty easy to tell: They send the same message over and over, often with the same link.

But there's a type of dating site scam that's far trickier to spot, and the people who operate it claim to be making thousands of dollars every month fooling vulnerable men.

The guide isn't available for free, in fact, it was being sold for Bitcoins on a deep web marketplace.

Bitcoin is cryptographic currency favoured by criminals as it allows semi-anonymous online transactions.

It's not just guns and drugs that are up for sale on deep web sites.

Vendors also list guides on how to commit other illegal activities.

But for the general good of the online dating world, and to hopefully offer some help to all of those handsome bachelors out there considering a bathroom selfie, I would like to offer this helpful little list of 10 photos guys should NOT post for online dating.