EVERY dancer starts out as a beginner.
If you are an experienced dancer, make it a point to regularly ask a beginner to dance. Without the opportunity to dance with an experienced dancer, a beginner might never move beyond that level. A bonus for an experienced leader is to ensure that one is connecting and leading properly.
If you are a beginner, it can be intimidating to ask an experienced dancer to dance, but I encourage you to try. A word of caution, however, is not to always ask the same person – it is to your benefit to dance with multiple partners.