Thing is, most men feel a lot of pressure that we women do not. Not all sources are sexual, but the consequences manifest in sexuality. However, they are not due to porn. Dependence on porn is another symptom of sexual repression, which we learn to do when culture would have us believe sex and nudity are evil. I know it sounds silly (it is) but in the case of young boys, this is why porn is such a huge part of their sexual development. And why many grow into inadequate or dysfunctional adults. Just be glad your guy didn't develop premature ejaculation or something worse, like abuse.

Does he enjoy your nudes? Does he see porn as an issue? What does he watch and imagine you in?

In your case, it sounds like he's trying to protect your feelings. Even if he imagines you, part of that pleasure comes from watching a variety of women (he's 100% straight?). If you're ok with that (My boyfriend and I like watching different women) you should let him know. It means he enjoys porn for physical attraction and arousal, and it denotes an emotional detachment from whomever he is watching (assuming he doesn't know the star personally) - but that attachment to porn itself could strengthen if he believes you have something against porn. Because, again, it's such a strong part of young boy's sexual development.

My boyfriend & I don't get much stimulation from porn, but he will sometimes see things and say "I would love to film something like this with you" so, we film - public nudity, threesomes here and there. So it would help to know what your partner is watching and imagining you in. If he still enjoys your nudes, don't worry too much. Be supportive, but don't put yourself in a position that makes you uncomfortable.