My husband has Lewy body dementia and lately he has been requesting to become intimate. I have no interest at this time. Being a caregiver diminishes any desires. In fact I don't want him to touch me. I don't know how to respond to him so that he doesn't get angry.
There are medications that can tamper the sexual urge and you can talk to his doctor about that.
If he (and you) would accept YOU touching him could it be done as part of his ADL's. Rubbing lotion on legs, back and arms to keep the skin moistened might help somewhat. But if you do not want to do this I totally understand.
If this becomes more of an issue then you really should talk to his doctor.
I would still reinforce the fact that you still love him and care for him and although you say you don't want him to touch you, you can still give him hugs as human touch is so very important for everyone.
And intimacy doesn't have to mean sex, it can be just holding hands, hugging or snuggling up to each other. Something you will miss when your husband is no longer here.