Bf can't feel it

Whenever me and my bf have sex he can't feel much (if anything at all) and I think it may be because his penis isn't very sensitive, does anyone have any idea what I could do to help? Basically the only way he can get off is if me or I just jack him off but even if we do it that way I'm not used to it so my arm gets tired and I gotta switch 😅 any Jess how to make sex more pleasurable for him??