It's hard for you to believe he's not very sexually experienced because he's black...seriously? Maybe his reservations are due to his health history or perhaps he doesn't want to risk procreating with you. Negative stereotypes are apparently ingrained in your belief system regarding your bf and I'm guessing that doesn't do anything to foster a closer, more intimate relationship. Sometimes the problem is starring back at us in the mirror. Good Luck.
Hello,
Your boyfriend may be having sex related anxiety. This usually happens in initial stages and the problem will disappear over a time. This seems to be absolutely natural. If his morning erections are good then the cause is psychological. Mean while he should take protein diet, regular exercise, remain stress free, and remove sex related anxiety.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.