비아그라에 대한 5가지 간단한 설명 설명
When the cGMP is wrecked by the phosphodiesterase-five enzyme, the erection finishes. Viagra stops phosphodiesterase-five from destroying cGMP so cGMP stays about lengthier, which ends up in a far more prolonged erection.
If you need assist remembering to take your dose of Viagra before sex