What Causes Poor Erection In Penis With Less Amount Of Ejaculation?

Hi Doctor, im 28 yrs old, my height is 5.6 and weight is 47kg. I got married in the year of 2008. we were under planing for 2yrs. and past 6 to 8 months we are tring for baby but not sucessed. by the way i feel that now a days my husband is not very much sexual oriented towards me. instead he is very much intested in self satisfaction by seeing porn movies and through mastribution. I found that he is undergoing this for past 7 to 8 yrs and now his age is 29 yrs. during our initial stage of marriage his pratise as not disturbed our sexual life a lot but now its creating a major hindrance for our sexual life and i feel very hard to change his habit. I scared that like before he is not getting eriction fast and the amount of samen comes out is also very less....i would like to know the reason for this,,,if i ask my husband he said im not that glamer engough to get his sexual attention and thats why he his under these pratise...its becoming a big question mark for our future....please advise.