The Agent in Training. The Agent, #2

In a post-apocalyptic future humanity is threatened by widespread male infertility. Those few men with high sperm counts become Agents, part of a government group assigned to impregnating women with the babies they want. But now that the Agency's youngest candidate is eighteen, he wants to prove himself. Luckily, one of his coworkers gives him the opportunity to show how potent he is!