“…clients and masculine escorts (Parsons et al, 2004); to analyze the contents of sex sales on the Internet (Lee and Castle,2006;Veena, 2007;Castle & Lee, 2008;Pruitt & Krul, 2011;Blackwell & Dziegielewski, 2013); the discussion between clients about feminine prostitutes about health and sexual unprotection (Langanke & Ross, 2009); information masculine escorts provide to their clients (Lee-Gonyea, 2009); language used on the Internet by prostitution clients ( Blevins, & Holt, 2009); about services offered and the health status in brothels (Chin et al 2009); sexual preferences of clients paying sexual services (Milrod & Monto, 2012); unprotection of sexual practices requested by clients (Adriaenssens & Jef Hendrickx, 2012); characteristics of communication in the contact between sellers and purchasers of sex (Jonsson et al 2014); the new risks of contact between purchasers and sellers of sex on the Internet (Jones 2015); normalization of masculine prostitution thanks to Internet (MacPhail et al, 2015); analysis of commercialization of sex on the web of three European cities (Pajnik et al, 2016). But all these studies refer to advertisements on websites, to the chat between clients and masculine/feminine prostiutes, and in very few cases to advertisements in newspapers and magazines (Chivers & Blanchard, 1996), and none of them to advertisements of flyers (Rúa et al, 2016), because perhaps their distribution is not allowed in many countries (France and Portugal, frontier countries forbid it).…”