at least some bottom articles of clothing remain on one or both sexual participants while they engage in the "motions" of sex (thrusting, etc) without actual penetration
"The dry sex was gay... well it was!" (LOL. can't believe you said this)
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.
haveing sex with your colth on, and involves vigorous humping and making out, as long as you have something covering your genital area the sex is considered dry
Sexual intercoarse were the femal is naked except for the panties. The man rubs his penis on her untill he cums. 97% safer that penis to vagina intercoarse.