I have troubled maintaining an erection during sex. would vaccume device be good resolution or it has some side effects ???

Vacuum device will allow erection and requires a constrictive band at penis base to maintain erection. While this may prolong erection it does not identify or resolve the central,issue, which is why a young man cannot maintain erection. Lack of erotic pleasure, hormone lack, venous abnormality are among reasons to explore. See a urologist to discuss this issue and hopefully, fix it as well.