Abstract
6α-Fluorotestosterone, an androgen that is not aromatized in a standard assay system, stimulated sexual behavior in both male and female rats. In males, it was as effective as testosterone. 19-Nortestosterone also stimulated more male sexual behavior than would be expected on the basis of its aromatizability in standard assays. In other tests of the aromatization hypo we used the anti-estrogen, CI-628. This drug inhibited androgen-induced sexual receptivity in female rats, but did not inhibit androgen-induced sexual behavior in male rats. In females, CI-628 antagonized testosterone and 6α-fluorotestosterone equally. These data suggest that the structures of androgens, rather than their abilities to be aromatized, determine behavioral effectiveness.
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