According to 'Health Yeating.sfgate.com' a woman in her twenties needs 1,949 calories per day.
Then Aked Scien Tists worked out that that one serving of cum contains 5 calories. Thus, in order for a woman to at a days calorie intake in a day, she needs to eat 390 servings of cum a day.
Lets then assume the average man can cum on average twice a day (and some days that's being generous). Thus you would need the man juices of 195 men every single day in order to intake just the calories.
UK Labour laws state that the minimum wage of any employable staff is £6.31 per hour. Assuming you could employ them for just the two hours of jerking, and not the wait time, the cost for all this sperm, per day is £2,460.90, for locally sourced semen, though you may be able to import it from abroad for less.
Comparatively speaking, a Big Mac contains 492 calories, at least according to Mensfi Tness, and costs £2.59 according to a recent scientific experiment I conducted. Thus you would only need 4 Big Macs, (costing £10.36 total) for the full calorie intake. Much cheaper. In addition, if the woman in question is rude to her server, she'll get some free cum on her burgers anyway.