So, some advice you asked for and some advice you didn't ask for.
I'm Jewish and was circumcized when I was 8 days old. I have a very sensitive penis. Talking with guys who were circumsized when they were adults - there is a higher possibility of problems with pain and infection as an adult but as an adult you are better able to take care of yourself and be aware if there are problems. If it's done by someone who is a trained specialist you shouldn't expect any loss of pleasure.
The advice you didn't ask for. It's a red flag when a person you are in a relationship with is telling you that you are "too unclean to touch" until you change an aspect of your body. Do not get circumcised/a tattoo/a piercing that you do not want to please someone else.