Sadly he will never have sex. Why? You guys know that meme about how you will awaken your secret wizard power once you hit age 30 while beeing a virign? Well, thats the truth, and it will be the key to defeat those monsters! He obviously already has unlocked minor magic power with his high drive, so once he reaches age 30, he will unlock godlike powers which will allow him to fight those monsters 1 on 1. He will die in the final battle, but before his last breath, he will rub one out (thus him still beeing a virgin) and that spunk will be used to artifically impregnate woman to create more warriors in case those monsters ever return. And those children will be even more powerfull since those virgin levels carry over (they are kinda like Prestige-Levels in video games). So once those children reach the age of 30, they will unlock powers equal to a virgin of 60 years of age!
Calling it now, this will be how this manga ends!