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It's hard to find the exact caloric content of semen, but it seems to be somewhere between 5 and 25 kCal per 5 mL, which is the average volume of an ejaculation. If we assume a nutritional value of 10 kCal per 5 mL and that a girl of her height and weight might need around 1200 kCal per day, then she would need to milk about 120 shrimps per day to get her 1200 kCal and live entirely off their semen. If she dedicated around 10 hours per day at 12 shrimps per hour to this task it should be completely feasible for her to extract all of the semen she needs to live while still having enough time to stream, sleep, and perform some other activities.
