Using one hand to stimulate two shafts simultaneously, forming a "bridge".
Arranging individuals "tip-to-tip" to allow for a four-at-a-time stimulation rate per person (using both hands to bridge two pairs). 8. Optimal Tip-to-Tip Efficiency
The "Optimal" strategy moves away from a naive one-at-a-time approach, which leads to "increasingly flaccid performance" as audience diversity grows. Instead, it proposes: Using one hand to stimulate two shafts simultaneously,