SemenSemen AnalysisSemen PreservationSperm MotilitySperm CountSpermatozoaInfertility, MaleEjaculationInsemination, ArtificialFertilityCryopreservationAsthenozoospermiaOligospermiaSperm BanksAndrologyVasectomyVaricoceleInsemination, Artificial, HeterologousSeminal Vesicle Secretory ProteinsMicroscopy, Electron, ScanningTestisMasturbationPregnancyCervix MucusAcrosomeGenitalia, MaleMicroscopy, ElectronCryoprotective AgentsSperm HeadSexual AbstinenceFertilization in VitroManuals as TopicTime FactorsFreezingInsemination, Artificial, HomologousSperm-Ovum InteractionsPregnancy RateTestosteroneSpermatogenesisLibidoGenital Diseases, MaleAntelopesSwineScrotumFertilizationCattleVirus SheddingPhenotypeSeminal VesiclesAzoospermiaMicroscopy, Electron, Transmission