(1) term used in foreign country (Africa most likely) where the female puts various substances (baking soda for ex:) to put in her vagina before intercourse, if the female were not to have dry sex, and to become lubricated instead she will be referred to as a slut....hence AIDS
(2) like sex, just with clothes on
African women are recommended to have dry sex for social purposes
masturbation sex where one or both of the partners are still clothed between the belly & the crotch, dry humping takes place, and one or both have an orgasm but there is no exchange of body fluids because of the layer of clothing. Called "dry" because there is no natural lubrication.