Redirect to minor sexual organ components.
No all the secondary organic parts of a sexual organ need to have it's own redirect. Sheath can be added to its associate parent organ via internal link, e.g. [[Penis|Sheath]], main anatomical part [[Genitalia|Sheath]], or a direct Wikipedia link ([[W:Penis|Sheath]]).
Going this path will result on a cascade effect ([[Clitoris]], [[Hood]], [[Labia Minora]], [[G-Spot]], etc...), conflicting redirects (Sheath may refer to both a part of the Penes on certain male animals, but also describes the female vagina), or double classification: [[Anus]]; part of the digestive or sexual system?. - Spirou 18:49, 30 January 2014 (EST)
"This redirect page is linked from several other articles, so it shouldn't be deleted". Since the terms listed are less than a handful, it's (more tedious and longer) to just change them instead of recreating the delete article (based on the reasons aforementioned). At the same time, other types of sheaths can be properly linked (internal and Wikipedia). - Spirou 18:26, 31 January 2014 (EST)