Sperm spot is a spot formed after semen is soaked or attached to the substrate and dried.
Sperm spot is a spot formed when prostatic fluid ejaculates or flows out and sticks to underwear or bedding under sexual stimulation. Because the trace formed after the semen is dried, the hardness is slightly harder than the surrounding cloth, such as the state after the paste is dried.
Sperm spots are mostly attached to the clothes of criminal suspects or victims, women's vulva or inner thighs, bedding, towels, paper, straw mats, sand, mud and so on.