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Because of the nature of the site. It is for people with questions about people they are interested in, that don't have other outlets for getting the answers. And the people that have the most questions are those that have the least experience.
So there is naturally a big draw for people that have not had a lot of sex, or for people that have been having conflicting feelings, perhaps struggling with natural desires vs religious upbringing, or with issues regarding sexuality or fetishism.4