the number 1 rule of fanfic is have fun and be yourself. the number 2 rule is the average healthy adult male can lose roughly 2 liters of blood before dying.
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For the record. The answer is about one pint. It doesn’t take very much to interrupt that process since an erection fundamentally depends on having “normal” blood pressure that’s then elevated by hormones and vascoconstrictors to a specific threshold.
So anything that lowers the baseline blood pressure— including even minor blood loss — will ruin the ability to get or maintain an erection.
That said. No two people have the same blood volume, so it’s really more accurate to say that about 10% total blood volume loss would make an erection impossible, and anything over 2% would make it more difficult to get or maintain one.
So a small guy that weighs 100 lbs has about 6 ish pints of blood, And would have to lose .5-.6 pints (about 1-1.5 cups) of blood before an erection became nigh impossible. Precious little, in the grand scheme of things.
Note that this does NOT scale like that, a 200 lb person doesn’t (usually) have 12 pints, they have closer to 10, because blood volume decreases slightly as body mass increases because the body builds more efficient pathways for it and more capillary vessels for even distribution. In point of fact, the maximum amount of blood a human body can possess at all no matter how big they are is around 12 pints. I have deleted my elaboration on this, but just. Know that there is a reason for the maximum size a healthy human in good body condition can be.
I am interested in the elaboration
