. completely omitted to consider gender as a potentially important variable. Since then, the relationship between gender and the propensity to transfer DNA has remained poorly investigated. In our study and, more specifically, on significant differences between males and females were observed with respect to hygiene (last hand-washing event) and personal (putting hands and objects in the mouth, putting hands in the hair) habits. However, several previous reports in the literature agree that female young adults generally have a better hand hygiene possibly due to a higher and more widespread tendency to practice socially acceptable behaviors; this fact is also reflected in our results, especially when the considerably wider range of biological fluids detected on male palmar surfaces is observed.