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Much as some of you guys would love it there, the penis is not a muscle, so the following picture is meant as a joke.

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This could be the origin of the joke…
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How will the vaccines be administered?
The Pfizer trials were all completed using the intramuscular route of administration of the vaccine. The emergency registration of the vaccine by the Medicines and Healthcare products Regulatory Agency (MHRA), under regulation 174 of the Human Medicines Regulations of 2012, has been authorised by the MHRA licensing this route only. The temporary supply licensing only allows the vaccine to be administered into the deltoid muscle of the arm.
The manufacturer advises that it should not be injected intravascularly, subcutaneously or intradermally. Intramuscular administration has the benefit of a better immune response to the vaccine, as the appropriate cells are present in the muscle tissue to initiate the immune response. Subcutaneous injections can result in a local reaction and this is less likely intramuscularly, making it the preferred route.
- From Informa Intelligence
Site of vaccination.

Penis: Is it a muscle?
“Nope. As much as you may love to werk your βlove muscle,β the penis isnβt actually a muscle. Itβs mostly made of spongy tissue that fills with blood when a person gets an erection.”
- From Healthline
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