What can i do to help the blood flow in my boyfriends penis ?

Do what you normally: Do . You do not have to do anything in particular. Be caring , proactive , listen to your boyfriend , try to read his body language . If understand what you are referring to , your boyfriend has some problem of erection . In that case if your care is not helping , tell him to see his pcp or urologist and he can be helped . Good luck.

Be supportive: If he has a blood flow issue, there is nothing you can do personally other than be supportive. Have him see a dr. Assuming there may be some erectile dysfunction issues and there may be medications he can take to have an active sex life with you.