▁can ▁reject ▁males ▁by ▁moving ▁away , ▁kick ing , ▁and ▁extr ud ing ▁their ▁ov ip os itor . ▁Cop ulation ▁last s ▁around ▁ 1 5 – 2 0 ▁minutes , ▁during ▁which ▁males ▁transfer ▁a ▁few ▁hundred , ▁very ▁long ▁( 1 . 7 6   mm ) ▁s perm ▁cells ▁in ▁sem inal ▁fluid ▁to ▁the ▁female . ▁Fem ales ▁store ▁the ▁s perm ▁in ▁a ▁tub ular ▁re cept acle ▁and ▁in ▁two ▁m ush room - sh aped ▁s per mat he ca e ; ▁s perm ▁from ▁multiple ▁mat ings ▁comp ete ▁for ▁fert il ization . ▁A ▁last ▁male ▁preced ence ▁is ▁believed ▁to ▁exist ; ▁the ▁last ▁male ▁to ▁mate ▁with ▁a ▁female ▁s ires ▁about ▁ 8 0 % ▁of ▁her ▁off spring . ▁This ▁preced ence ▁was ▁found ▁to ▁occur ▁through ▁both ▁disp lacement ▁and ▁in cap ac itation . ▁The ▁disp lacement ▁is ▁attributed ▁to ▁s perm ▁handling ▁by ▁the ▁female ▁fly ▁as ▁multiple ▁mat ings ▁are ▁conducted ▁and ▁is ▁most ▁significant ▁during ▁the ▁first ▁ 1 – 2 ▁days ▁after ▁cop ulation . ▁Dis p lacement ▁from ▁the ▁sem inal ▁re cept acle ▁is ▁more ▁significant ▁than ▁disp lacement ▁from ▁the ▁s per mat he ca e . ▁In cap ac itation ▁of ▁first ▁male ▁s perm ▁by ▁second ▁male ▁s perm ▁becomes ▁significant ▁ 2 – 7 ▁days ▁after ▁cop ulation . ▁The ▁sem inal ▁fluid ▁of ▁the ▁second ▁male ▁is ▁believed ▁to ▁be ▁responsible ▁for ▁this ▁in cap