Oral-to-oral transfer of lactic acid in passionate exchange Relaterade taggar:%d8%a7%d8%af%d8%a7%d8%a7%d9%88%d9%88%d8%a7%d9%84%d8%a7%d9%84%d8%aa%d9%88%d8%a7%d9%84%d9%88%d8%a7%d8%af