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Euchresta horsfieldii (Lesch.) Benn is one of the medicinal plants that grows in the highland forests of Bali. This plant is believed by the community as a powerful aphrodisiac. The study was begun with the collection of Euchresta horsfieldii (Lesch.) Leaf samples which will be extracted by maceration method. Three types of solvents were used in maceration namely aquades, 70% ethanol, and chloroform. Phytochemical screening includes testing of alkaloids, flavonoids, triterpenoids, steroids, phenolics, tannins, and saponins. The purpose of this study was to prove the effect of crude extract of Euchresta horsfieldii (Lesch.) leaves as aphrodisiac on the mounting behavior of male mice. The test parameters in this study are phytochemical screening and mounting behavior which consists of introducing, climbing, and coitus. The research design used was a completely randomized design (CRD) with two treatment groups and eight replications for eight days. The data obtained was analyzed through t test. Phytochemical screening results showed that 70% ethanol has the best ability to bind secondary metabolites in leaf samples, so that the extract with this solvent was tested in vivo on male mice. Based on observations on mounting behavior, it was shown that the crude extract of Euchresta horsfieldii leaves had no effect on the increase in frequency of mounting behavior of male mice in both the acute and chronic phases