<p>Sex is already up in emergency situations that should get special handling from various parties<br />especially religious figures, education activity and government whoearnthe trustofthe peoplefor the<br />welfareandhappinessof life of thenation. The incidence of children lack knowledge about sex in 2009<br />due to lack of information. The purpose of this research was to analyze the effect of counseling about<br />early knowledge of sex to the elementary children in the SDN Candimulyo 1 Jombang.This research<br />design was pre-experimental. This research experiment was conducted on March until July 2015.<br />Location of the research was in the SDN Candimulyo 1 district of Jombang, Jombang regency. The<br />independent variable in this research was counseling of sex to the elementary children. The sample<br />taking used by simple random sampling method with the sample was 32 children.The research result<br />obtained there was increasing knowledge of sex before being conducted counseling were 19 children<br />(59%) and after being conducted counseling occurred increasing knowledge of sex was amounted 37<br />children (84%), while from the result of wilcoxon test obtained result 0,008, so H1 accepted and H0<br />rejected.<br />The conclusion of this research was there’s the effect between the counseling against knowledge of sex<br />to the elementary student in the SDN Candimulyo 1 Jombang, in respect of there was still lack of<br />knowledge about a good behavior meant boys and girls in terms of dressing can be applied well in<br />accordance with the teachings of Islam and it started early<br />Key words : knowledge of sex, sex</p>