Perhaps the pressure comes from, I gotta be at my best every day, every time, or her desire for me will lessen even MORE.
I suffer from this, from time to time. I worry that I am not 'sexy' enough, or thin enough, or that the sight of my saggy breasts while feeding BabyPot is turning him off. Worry worry worry.
It's hard to keep your own self image strong when the other person is seemingly immune to you, kwim?
I think he is fishing for some reassurance from you. Unfortunately I know from my own past that this can be a bottomless well. Just do what you feel comfy with and he will have to shore his own image up.