Hentai--to increase load size (I assume you mean the amount of cum a guy produces) -don't drink. don't smoke, don't do drugs and take vitamins--especially vitamin E and zinc---google "vitamin E for male sexual health" and "zinc for male sexual health" to get info
a male's sexual performance depends on his over all health
--if he is overweight, on high blood pressure meds, on cholesterol meds, diabetic, smokes at all, or drinks alcohol often, his health will be weak and so will his dick