Rohypnol was used by ravers in the late 80's and early 90’s, and more recently, has been used to 'spike' unattended drinks of females (or sometimes males) on a night out.
Viagra is something that men use to increase sexual pleasure and the ability to achieve an erection.
Viagranol is a proposed blend of the two
drugs – primarily used by ugly
people to get laid by men they
fancy – sufficiently slowing down the mind of the victim to the point that the person barely knows what’s going on to start with.
At this point, the Viagra aspect
kicks in and ensures lengthy erections for the victim which the perpetrator ‘enjoys’.