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Yes, there are girls with huuuge knockers in Sosua. Believe me, if you come, you'll find what you're looking for. Pay in pesos please and make sure to negotiate what you want beforehand. Start off with short time (1 hour). Being a first timer, those women are sharks and will test you. Chika proof your room, and don't trust them. Please don't send them money western union. Don't catch feelings. If something doesn't feel right, ABORT. This should be in everyone's playbook before you have your fun.
Light skin is rarer in Sosua, but you can still find them if you look and you might have to pay a premium. I'm not sure how much time you have or your finances, but I found many light skinned Dominicans I'm attracted to at a decent price. Honestly, I can give you a playbook, but you're going to have to get your hands dirty and just go and do it. It all depends how fast you can learn "the game" and fit your needs. I didn't really get in the know until my second trip but was learning from reading on this forum in addition to trial and error.