Destiny Lovers Vol. 7 (manga)
MAKE LOVE AND WAR
Stranded on a tropical island with his fellow virgin prisoners, Fujishiro has attempted to serve as a mediator between his team and the island's man-hating female residents. But when the Administrator reveals that she's let a terrifying monster loose in the forest, the time for mediation is over! Fujishiro and the others are given a single choice: have sex and be given weapons to fight the Reajuu...or remain chaste and fend for themselves!