Our expert says:
There are 2 stimulation pathways that lead to an erection. The first is directly from the brain to the penis and is responsible for the erections you get when you think erotic thoughts. The other pathway is the direct effect of genital stimulation – this pathway goes mostly though a spinal reflex – ie goes from the penis to the spine and then straight back to the genitals – this is what produces the erection is the genitals are touched. The so called erogenous zones below the navel, also go through this pathway. The small of the back is also an erogenous zone. Yours seems to be exceptionally sensitive – you are a very lucky man indeed
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