This article resumes the results of research on the latency of particular crimes against morality (rape, sexual violence, and sexual abuse, procuring and soliciting prostitution, manufacturing of child pornography). Among others, in order to collect data from the respondents (size of a sample — 153 male representatives and female representatives above 18 years old) an explorative method of questionnaire has been used. Main issues explored were the following: personal experience with these types of crimes (how, where, when, etc.); willingness to report these crimes to the police (why yes or no, when, under which circumstances, how to increase their willingness, etc.); motivation for cooperation with the police; effectiveness of crime detection and clarification (criminal police service, investigative service, national police organisation); main problems related to crime detection and clarification; estimations of the level of latency of particular crimes against morality and real criminal rate.