BACKGROUND "Casual sex" is seldom as non-selective and random as it may sound. During each sexual encounter, people consciously and unconsciously seek their casual sex partners according to different attributes. Influential to a sexual network, research focusing on quantifying the effects of physical appearance on sexual network has been sparse. METHODS We evaluated the application of Log odd...

BACKGROUND Every summer, young people flock to nightlife-focused holiday resorts around the world to find casual work. Despite being exposed to hedonistic environments, often for several months, little is known about their substance use, sexual activity and health service needs over this extended amount of time abroad. METHODS A short anonymous questionnaire examining alcohol and drug use, se...

BACKGROUND Nitrite inhalants ("poppers") are peripheral vasodilators which, since the beginning of the epidemic, have been known to increase risk for acquiring HIV infection among men who have sex with men (MSM). However, few studies in recent years have characterized use. From 1999 to 2004, new HIV diagnoses among MSM in British Columbia increased 78%, prompting us to examine the prevalence an...

In this paper, we discuss why Massively Multiplayer Online Games (MMOG) need to attract both hardcore and casual players and study the evolution of MMOG features for this purpose. 1 Hardcore Gamers and Casual Gamers Must Play

This study addressed the question: Can nonhuman organisms be conditioned to respond discriminatively to abstract features of their environments without unconditioned reinforcement? It demonstrated that two pigeons can be conditioned to maintain an interaction in which one pigeon has access to a discriminative stimulus that the other needs in order to emit a reinforced response, and responds in ...