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While the vaginal canal is full of blood vessels, male genitals are mostly skin, which is a pretty good barrier, Talebian says

Science (1979)

Collectively, mixed results from antioxidant intervention studies may be interpreted by the variances in participants' baseline redox status, the dose and length of the antioxidant supplementation, and the choice of oxidative stress markers

J Endocrinol Invest (2017) 40:839

Indeed, this would indicate that there are significant differences in the detection capabilities of these two methods and this should be considered when deciding on an appropriate methodology for particular biological applications