This is more of a scientific inquiry than a concern that giving my boyfriend oral sex will screw up my diet – I'm just interested.
I don't have an exact number for you, but it can't be much. Semen is mostly water with the rest made of sugars and some protein (it's essentially nonfat). I'd estimate about 10 calories – maybe a little more. But remember, most health practitioners consider swallowing semen an act of unsafe sex. Even though it won't get you pregnant, it can transmit STDs.
Do you find yourself masturbating more often during some seasons than others? Why?
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