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Vagi­nal lubri­ca­tion is a lubri­cat­ing flu­id that is nat­u­ral­ly pro­duced in a wom­an’s vagi­na. Vagi­nal lubri­ca­tion or moist­ness is always present, but pro­duc­tion increas­es sig­nif­i­cant­ly dur­ing sex­u­al arousal in antic­i­pa­tion of sex­u­al inter­course. Vagi­nal dry­ness is the con­di­tion in which this lubri­ca­tion is insuf­fi­cient, and some­times arti­fi­cial lubri­cants are used to aug­ment it. With­out suf­fi­cient lubri­ca­tion, sex­u­al inter­course can be painful to women. The vagi­nal lin­ing has no glands, and there­fore the vagi­na must rely on oth­er meth­ods of lubri­ca­tion. Plas­ma seep­age from vagi­nal walls due to vas­cu­lar engorge­ment is con­sid­ered to be the chief lubri­ca­tion source, and the Bartholin’s glands, locat­ed slight­ly below and to the left and right of the introi­tus (vagi­nal open­ing), also secrete mucus to aug­ment vagi­nal-wall secretions.