Có nghiên cứu & thống kê hẳn hòi anh ơi, nguồn đáng tin cậy. Anh cứ nghĩ thử như vầy, quy đầu có bao nhiêu mút thần kinh là bấy nhiêu sự sung sướng, anh cắt bỏ mất 1 phần đó thì cũng bớt 1 phần sung sướng rồi.
Male circumcision decreases penile sensitivity as measured in a large cohort.
The analysis sample consisted of 1059 uncircumcised and 310 circumcised men.
For the glans penis, circumcised men reported decreased sexual pleasure and lower orgasm intensity. They also stated more effort was required to achieve orgasm, and a higher percentage of them experienced unusual sensations (burning, prickling, itching, or tingling and numbness of the glans penis).
For the penile shaft a higher percentage of circumcised men described discomfort and pain, numbness and unusual sensations. In comparison to men circumcised before puberty, men circumcised during adolescence or later indicated less sexual pleasure at the glans penis, and a higher percentage of them reported discomfort or pain and unusual sensations at the penile shaft.
https://www.ncbi.nlm.nih.gov/pubmed/23374102