“The bride was in the parlor, explainin’ to the groom,
The vagina, not the rectum, is the entrance to the womb.”
—- “The Gatherin’ of the Clan” (dubiously attributed to Robert Burns)

https://www.newsweek.com/couple-couldnt-conceive-because-theyve-been-having-sex-wrong-way-four-years-1089162