Hi, im 26 age,i got married 7 months before untill 2 months before my erection was good , but now a days my erection is good only at the time of fore play , while approaching for sex i losing my erection and i cannot do sex on those nights , so far 3 times i took manforce 50 in last one month to get erection , please tell me what is reason for losing erection , how many days in a month we take manforce tablet, kindly reply ?