Yes.
Conservation of momentum, some 'facts' about average ejaculation volume and speed, and semen density, from the Web and personal experience, and an average adult human male's mass would indicate a backward speed of roughly 14inches/hour.
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Yes.
Conservation of momentum, some 'facts' about average ejaculation volume and speed, and semen density, from the Web and personal experience, and an average adult human male's mass would indicate a backward speed of roughly 14inches/hour.