the dartos fascia to Buck's fascia is responsible for the high degree of mobility of the penile skin over the underlying tissue. It is also responsible for carrying the blood supply of the penile skin, a longitudinally-coursing anastomotic network of vessels that arise from the external pudendal vessels.

In the scrotum, the dartos fascia acts to regulate the temperature of the testicles, which promotes spermatogenesis. It does