luxurious indulgence, usually by a female, in a plentiful supply of semen. Her body is usually naked - as "bath" would suggest - both for practical and sensual reasons. For reasons of the standard male performance (5-12 cc of fresh ejaculate), more than one man is likely to be called on to turn on the supply for her. The alternative - pre-packaged sperm from one or more sources - is rather too gruesome to contemplate. And a girl can get mighty cold and bored waiting around in her birthday suit for a fully satisfactory coverage of her bathing needs by any one man's repeated creative outputs.
Cumbaths are by nature often more easily come by in porno - with the help of fluid supplements and substitutes, and a few sleights of hand - than in the hard light of workable reality.
Girl/woman who gets fucked on an extreme frequent base, cum from the previous ejaculationwill still be dripping out of her cunt when the next dong arrives.
Rodney: Geez man, I had a great fuck with Erica last night
Carl: Ow shit, your screwed that cumbitch as well? So it was your load which made me ride so smooth!