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[Sexual assault: could the perpetrators not be identified more often?].

Sex crimes represent an important category of crimes. Physicians have to deal with them when treating victims in the emergency room. Forensic scientists, on their side, try to collect any trace of physical contact between victim and aggressor (sperm, fibres, etc.). But their success is largely dependent on the quality of the first intervention. Crucial evidence can be damaged or lost. Collaboration between physician and forensic scientist is essential when dealing with sex crimes to provide victims with the medical care they need, while using every piece of evidence which will allow the identification of the authors.