Beginning of Human LifePersonhoodJudaismHuman CharacteristicsLifeValue of LifeBioethical IssuesHuman DevelopmentSperm CountEthical TheorySperm HeadReligion and MedicinePhilosophy, MedicalLongevitySperm CapacitationQuality of LifeMoralsEthics, MedicalPregnancy Reduction, MultifetalEmbryo ResearchCloning, OrganismBiological EvolutionSperm MaturationAgingSperm TransportSperm-Ovum InteractionsSperm Injections, IntracytoplasmicAcrosomeFertilizationInfertility, MalePregnancySperm MidpieceSemenSperm BanksEpididymisSemen PreservationSemen AnalysisZona PellucidaTestisFertilityEjaculationCryopreservationSperm WhaleOligospermiaOvumTime FactorsSeminal Plasma ProteinsAsthenozoospermiaInsemination, ArtificialProtaminesSea UrchinsOocytesReproductionLife Change Events