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 Kama 4/18 and Siddur
 The Reason: The impure spirit resides on the hands upon having marital relations. This applies according to all. See Halacha 2 in footnotes.
 Ben Ish Chaiy Toldos 16
 Elya Raba 4/12; Machatzis Hashekel 4/17; Soles Belula 4/14; Machazik Bracha 4/6 in name of Makor Chaim; Ben Ish Chaiy Toldos 16; Kaf Hachaim 4/61; Ketzos Hashulchan 2 footnote 29 regarding Levaya; Olas Tamid; Shlah Shaar Haosiyos 9; Lev Chaim 1/63; Kaf Hachaim [Falagi] 7/26; Ruach Chaim 4/3; Chesed Lealafim brought in Kaf Hachaim 4/61.
Kama 4/18; M”A 4/17; Seder Hayom; Kneses Hagedola all rule that one is not required to wash three times. Nevertheless the custom today has become to follow the opinions brought above
 See Ketzos Hashulchan 2 footnote 29; Ben Ish Chaiy Toldos 16; Kaf Hachaim 4/62; Halichos Shlomo 20 footnote 86;
Other Opinions: Shulchan Hatahor 6 writes it suffices to pour three times consecutively on each hand. See Piskeiy Teshuvos 4 footnote 165