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Found some research that said your pee-slit would tighten up near the point of ejaculation. They reason that this is done so your sperm will shoot as far out as possible in order to aid impregnation.
This seems to be a perfect reason to trade BJs with a buddy to determine if this actually does occurs.
Or if you are lucky it could be done as a college project. Individuals might present their dicks through a “glory hole”. One trained research student would suck each cock while another student measured each slit from start to finish.
As with most good research you might need to do this several times for a meaningful statistical value. As I remember at least 25 samplings are needed to start this kind of work.
This seems to be a perfect reason to trade BJs with a buddy to determine if this actually does occurs.
Or if you are lucky it could be done as a college project. Individuals might present their dicks through a “glory hole”. One trained research student would suck each cock while another student measured each slit from start to finish.
As with most good research you might need to do this several times for a meaningful statistical value. As I remember at least 25 samplings are needed to start this kind of work.