All you can say in this site's defence is that it, rather than reality, occupies the warped minds of some of the planet's most twisted people; gods know what they would get up to if it wasn't here. In these arguably insane times, any lessening or attenuation of madness is maybe something to be thankful for.
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Even "de-oxygenated" venous blood still has a good 75% oxygen saturation, and while initial blood contact with the air can almost reach the high saturation that arterial blood has (roughly 99%) this quickly diminishes due to red blood cells dying. Therefore, after any prolonged exposure to to the air, blood will take on a darker colour, and this process is quicker with venous blood due to the lower overall saturation level.
If you're going to be a pendant, at least be meticulous about it.
...especially if its venous blood.