About Vajroli mudra

Vajroli mudra, the Vajroli Seal, is a practice in Hatha yoga which requires the yogin to preserve his semen, either by learning not to release it, or if released by drawing it up through his urethra from the vagina of "a woman devoted to the practice of yoga".
Root Chakra Mandala

Root Chakra – Primary energy storage

The is also called in which is primary energy . It is located at the base of the spine in the vicinity of the coccygeal plexus beneath the sacrum. It is associated with your most basic survival needs. Where is root is located on the ? Muladhara is located at the base of the spine, the pelvic floor, and the first three vertebrae, the root chakra is responsible for your sense .