"Not so much discomfort. More jealous that you're currently racking up more shared orgasms than me." True, he was only human and had a comfort limit just like the rest of them, but few had ever pushed it just by talking to him - though Tristan was definitely a worthy contender.
While he saw how Tristan inspired many people to tell him how some things were better left unsaid, Adam appreciated that someone felt they were able to go there with him. Sex in general wasn't a touchy subject for him, and usually when he refrained from talking about it, it was for the comfort of others whose awkwardness tended to make him empathically unsettled. The exception was when it became very personal between him and whomever, when he liked to keep certain intimacies between the two of them, but that was just him - and no reflection on how he felt others needed to be.
So Adam told him, "You don't have to avoid anything with me, as long as we can occasionally talk about things other than how your legs end up wrapping around some handsome guy's waist. Believe it or not, I'd be more disturbed if you started telling me about golf or insulted my favorite movies."