ask your bf to visit www.nofap.com or reddit.com/r/nofap as well as http://yourbrainonporn.com/, he must have had excessive masturbation habit as well as watching too much porn.

from tcm perspective, his condition is 肾虚 which is caused by excessive ejaculation resulting in loss of libido. symptoms include - loss of morning glory, premature ejaculation, erectile dysfunction, delayed ejaculation, profused sweating, loss of stamina, premature grey hair / balding, bad breathe, bad temper (easily go on fire), loss of socializing, bad memory.

usually for guys they mostly reach their 'menopause' period after 70 of age. but most guys today get those symptoms @ 15 / 20 / 25 / 30 due to porn being too easily accessible. All ejaculations result in loss of sexual energy, and for guys, its the male hormone that is affected the most.

I know the feeling and how badly it affects all the lovemaking sessions, but i ask you to give him a chance, visit those website and read how porn affects the guys  and make them prematurely sexually impotent and then talk to him about it.

I am also one of the victim of porn era, being addicted as early as 2002 when i was 12, and spent most of the time watching porn and masturbating, in just 3 years time i had all the symptoms of male menopause aka 肾亏and my gf has experienced similar things during the early days of our relationship, and it badly affected our relationship and i felt shit of course. However, ever since i changed few years ago (basically no more porn use), i started to enjoy normal sexual life again, and there is no more premature ejaculation or erectile dysfunction problems. My grey hair, from 40% at the age of 15, to now less than 10% in age of 25.

finding western docs and taking viagra wont solve it but will only make matters worst.