Heroin really isn't that expensive. It is the cheaper option for most opiate addicts. You can only keep up an oxycodone (or any other prescription painkiller) habit up for so long before you have to switch to something cheaper and more effective. Also, do people really shoot heroin into their genitals to get aroused? I thought that was only because they couldn't find any veins. Opiates usually make it hard to get an erection, hence the term "dope dick."