The Frii Wilii Crotch Support | Counterpart Protection

On a serious note, the Frii Wilii utility patent provides a specially-designed frontal crotch support for Wilii's counterparts. This crotch support allows you to Frii Wilii without hurting yourself due to epididymal hypertension, otherwise, known as “blue balls.” 

Epididymal hypertension  can occur in males who "go commando" for extended periods of time.