Tantric Breathing Technique to Prolong Sexual Intercourse:
The following technique is a variation of Kapalbhati Pranayama and it is simple yet very effective.
During sexual intercourse, as the excitement peaks for the male and he approaches orgasm he should begin to do Kapalbhati Pranayama through the mouth. Specifically, he should puff air out of his mouth while pulling in the stomach muscle sharply with each exhalation. As in Kapalbhati, allow the stomach to relax for the recoil inhalation to take place. This rapid puffing out of air through the mouth changes the blood chemistry and will retard ejaculation by easing the blood supply to the male sexual organ.
As with any skill, practice makes perfect. In Kapalbhati(respiration exercise-called fire breathing) concentration is on exalation , the inhalation is automatic.