No significant differences in the proportion of males that orientate to females and in the percentage that copulate are found in desat2^D homozygous or heterozygous populations compared to wild-type, whereas courtship latency and duration are affected. The shortest period of courtship latency is found in pairs in which the females are desat2^D and the males wild-type. A significant reduction of courtship duration is found in desat2^D homozygous pairs.