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Hi I don't really think that you will have hard time ranking up in google for adult toys store. My friend ranked #1 successfully for multiple keywords related to adult toys store. His target was local and his google page was ranking number 1 for certain terms. Also what i think is you don't really have to build backlinks from porn websites. You can create quality contents regarding your brand and then get quality backlinks to the store you are trying to rank. So what i think is you really don't have to worry.