To seduce an inexperienced guy to get sperm

All women are treacherous and cunning, and if they offer you sex, then with a specific purpose and, as a rule, self-serving. A mature and accomplished woman empirically and with a blowjob (which is logical) seduces a guy with the goal of extracting his sperm and extracting it from the depths of the vagina (not logical) and then selling it. All the same plot worse than in thrillers.