When performing oral sex all while unknowingly having the disorder "human seminal plasma hypersensitivity", your throat suddenly closes and you can no longer breath causing you to die. Death Blow.
Human Seminal Plasma Hypersensitivity:
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My girlfriend was giving me oral and then all of a sudden started suffocating and died, little did I know she would suffer a death blow. If only I had known she had the human seminal plasma hypersensitivity disorder.