Apomorphine: facilitation of sexual behaviour in female rats

Sexual receptivity of spayed female rats was studied by recording lordosis responses to a mounting male. Administration of apomorphine (0.25 mg/kg) to oestrogen+progesterone-primed females produced an increase in lordosis behaviour 2--48 hr after injection. An increase was also found when apomorphine was substituted for progesterone. These results suggest a role for dopamine in controlling sexual receptivity.