For all the talk of six-seven, its older sibling, 69, is still the reigning number in our world of popular culture. When it comes to sex positions, it represents the ultimate equal exchange of pleasure: Visually, it's yin and yang. This can be one of the trickiest sex positions to pull off simply because our bodies rarely fit together so neatly. That’s why we’re creating this guide to 69ing, including how to make it as pleasurable as possible, according to experts and self-proclaimed 69 enthusiasts. Considering everyone involved in a 69 is already occupying their mouths, this is one of those positions that makes oral communication trickier.