PG Diploma in Sexology and Psychosexual Counseling. For More Info WhatsApp- 9604715783. The frenulum (under surface of glans) is similarly sensitive to touch. Frenum is the longitudinal fold by which the loose foreskin is attached to glans if the fold is not removed by circumcision. (It is advisable to preserve Frenulum during Circumcision.). there is minimum of sensation in the skin covering the main shaft of penis