@lola222,
Anyone who cares about you is going to do what they can to make you happy, right? If you are worried about offending him, uh, why are you even showing your naked body to him, let alone letting him touch you?
Sorry, I may be old-fashioned, but sex is an intimate act. If you can't communicate with that person without fear of offense, if you feel you are walking on eggshells around them, then no wonder you've got problems relaxing enough to become aroused.