How to tell

You could google 'calories semen.'

IIRC, it's about 15 calories on average.
 
I know my cum varies a lot. The more sexual tension that has build up from writing or chatting about sex the more cum I produce.
 
Google says "Each teaspoon of ejaculate has about 5 - 7 calories".

Right. So if the average first load of a young, healthy male amounts to about a tablespoon, that'd be about 15 calories, like I said.

While there's some debate on the amount and caloric value and there are a lot of things that factor into the amount of ejaculate in a load, you can figure it's well under 50 calories, even if the guy produces far more ejaculate than average. Even if we overestimate and say a load is 50 calories, most people burn at least that amount during the course of a good blowjob.
 
Well, if you're thinking about giving a blowjob to 10 different guys in a day, it might become a calorie issue. I wouldn't think that would be advisable without condoms, though. You're more likely to go into negative calories if you're blowing the same guy a lot of times. ;)
 
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