Vanku

Yanase T, Tajima T, Katabami T, Iwasaki Y, Tanahashi Y, Sugawara A, Hasegawa T, Mune T, Oki Y, Nakagawa Y, Miyamura N, Shimizu C, Otsuki M, Nomura M, Akehi Y, Tanabe M, Kasayama S. Sperm will stay viable in the feminine reproductive tract for about forty eight hours, although this can be fairly vari...