What can I do if I don’t want to make noise?

I have never felt any inclination to moan during sex and even when masturbating, I am usually dead quiet with little change in breathing.  I know my partner wants to pleasure me and it hurts him when I am unresponsive.  I’ve never been able to master “faking it” and I feel uncomfortable forcing myself to make random sounds.  Are there any non-audio things I can do to reassure him?  Even though I don’t necessarily always feel physical pleasure out of sex, I enjoy the emotional intimacy.  Is it possible to have one without the other?

You are allowed to enjoy the emotional intimacy of something without enjoying the physical sensation of it, and hopefully your partner would be okay with that, at least sometimes. But if you show signs that make your partner think you’re physically enjoying something when you’re not, you are ultimately lying.

That might make your partner feel better short-term, but it’s probably not a good foundation long-term for a relationship, or for either of you to enjoy your sex lives (he’ll get encouraged to do things you don’t actually enjoy). Your partner should get over feeling hurt (it’s unproductive and unfair), but you should also try working on finding things you do find pleasurable and communicating what those are to him.
 
Even if he shouldn’t feel hurt, your partner’s interest in your enjoyment being clear isn’t unreasonable. Aside from his right to desire whatever sexual pleasure he wants (including the audio signals), which he could seek elsewhere if you can’t find something that works for both of you, his interest could also just come from being a decent guy who doesn’t want to be pressuring someone to do something they’re not into.
 
If you try making sounds, you may get over your discomfort and even come to enjoy it. You can also try making sounds that aren’t fake, but instead just clear in their intent to communicate pleasure (and consent). You could make a sound like the conscious “Mmm” people offer when eating, or you can use words, like “that feels nice” or “keep going.”

You can also just explain all, or some, of this to your partner. Non-auditorily, you could show interest by touching your partner (rubbing his head, squeezing his hand), by smiling, or by actively participating.

Recommendations: A few general guides to sex and relationships.