[Ahem. Van takes a second to search for the right words... Was there a right way to say this? He wasn't sure... But he had to give this girl one thing, she was very curious.]

A-Anyway... The usual technique is an exchange of bodily fluids. Blood and saliva can give a small injection, but uh... Sex is the more effective way since it involves more physical intimacy between both parties and an easier way to produce higher levels of mana.