it doesnt really matter, the foreplay its almost you enjoying while giving some pleasure, you need to add saliva to it in order to "taste" it, it does not have a certain flavour. the fluids are mostly salty because it mostly formed by oxigen hidrogen nitrogen carbon and ammonium.. the skin since its not an exposed part and more internal organs are formed of collagen, keratin, elastin. formed mainly of glycine and proline ( again nitrogen, oxigen, carbon) so what does it tastes?
take a piece of charcoal, add water, add, a bit of amonium, salt, and cetone, and enjoy.
returning to the foreplay, its good, and you will enjoy the sensation of being licked while licking somebody than the taste.