marihuana: There are many believes about how marihuana influences Sex life. These statements are so different that neither can be considered true. Some people say that marichuana makes intercourse longer and intensifies orgasm. Others claim that in has no effect at all. marihuanas influence upon fertility has much more proofs. Some reseaches revealed that marihuana smoking can affect semen production in men and damage ovulation in woman. It was found out that if a man smokes marihuana 4 times a week, his testosterone level dicreases enormously within half a year. 35 per cent of marihuana smokers have low spermatazoons concentration and 10 per cent are impotents.