“…In addition to the pharmacological impact of synthetic drugs, the group or venue settings, which are more likely to be associated with synthetic drug use, are also believed to be conducive to risky sexual behaviors (Laidler, 2005; Maxwell, 2005). Evidence suggests that synthetic drug use is more prevalent in entertainment venues, such as dance clubs and discos, or social group gatherings in China (Xia & Yang, 2008) and worldwide (Calafat, Gómez, Juan, & Becoña, 2007; Mattison, Ross, Wolfson, Franklin, & HNRC Group, 2001; Parks & Kennedy, 2004), which is found to foster frequent polydrug use (Fendrich, Wislar, Johnson, & Hubbell, 2003; Klitzman, 2006; Lankenau & Clatts, 2005; Operario et al, 2006) and an increase in sexual partners and the likelihood of group sex (Fendrich et al, 2003; Zule et al, 2007). The environment of many entertainment venues, such as hot temperatures, loud music, and overcrowding, can further intensify the stimulating effect of synthetic drugs (Calafat, Juan, Becoña, Mantecón, & Ramón, 2009; Parrott, 2004).…”