由西尔维亚·阿隆索,马里奥·卡萨斯,胡安·迭戈·博托,布鲁娜·库希,洛拉·杜埃尼亚斯,Lola,Dueñas,英格丽·加西亚·荣松,埃尔薇拉·明戈斯,乔恩·艾瑞亚斯,奥斯卡·卡萨斯,Miryam,Gallego,Aleix,Melé领衔主演的性本能是一部综合评分0.0分的西班牙欧美剧。Marco(MarioCasas)isayoungbusinessmanwhomanagesoneofthemostsuccessfultechnologicalcompaniesintheworld,ALVA,whichhasjustlauncheditslatestprototypeintothemarket-CYCLONE,anelectriccarpropelledbyturbinesthatturnwindintoenergy.HisfriendandclassmateDiegoworkswithhim,alongwiththelatter'swife,Bárbara,theefficientmarketingmanagerofthecompany.Eva,ayoung,ambitiousengineerwhohasalottohide,alsojoinstheteam,andshewilldisruptthebalanceatwork,bothemotionallyandprofessionally,betweenthetwobusinesspartners.Inspiteofbeingapopularguy,Marco,unlikeDiego,doesn'thaveanexcitingsociallife.Heisasolitaryman,andnoonehasaccesstotheintimacyofhissoul,apartfromhispsychologist,SARA,onwhomheisemotionallydependent.Marcoishauntedbyahugenumberofghostsfromhispastand,althoughhetrieshardtoscarethemaway,heonlyfindscomfortinsportandinfrequentingaprivateclub.Peoplegotherejusttogetpleasureandgivefreereigntotheirwildesteroticfantasies,withoutfearoffallinginlove,aseveryonehastowearamasktohidetheirfaces.ButeverythingchangeswhenMarcomeetsCarol,theneweducationalpsychologistwholooksafterhisbrotherJosé,an18-year-oldboywithproblemsofautism,withwhomhehasadifficultrelationship.Withher,hewillalsomeethisworstenemy-himself.Thankstoher,hewilldiscoverthatitisnevertoolatetolove,evenifitbringssomepainalongwithit.