hi iam 26 years old and i cant seem to sustain an erection i i want to know what is the cause of this. its like when i go to have sex iam watching myself try to get an erection or wondering why am i not erect yet when i masturbate it doesn t even get fully erect like it used to in my teens. i have no morning wood at all when i try to get an erection sometimes its like i have to try to concentrate hard to get it up then i start to watch it to see if it will stay up then it just dies out..does masturbation or porn have any effect on this problem i mean i watch porn and masturbated in my teens but i dont think i did it excessively just normal as any teenager i still do sometimes..bottom line i want to get to now what is causing this issue