In tantra they say: Never make love unless you have checked your nostril — never make love. If the man is breathing from the feminine nostril then the woman has to breathe from the male nostril. Then there will be real orgasm. Otherwise, love will be just a wastage of energy — not more than sneezing. You will feel relived after a sneeze — a good sneeze, one feels relieved — but nothing much will happen out of it.