Evidently, they don't want to LOOK at it, they want to FEEL it. Tell a straight man he *should* desire tits A, B, or C, instead of lusting after DDD.
@Okashii81's analogy is spot on. It's no more "disrespectful" than a client disappointed by a provider using 10-year-old pics, or photos of someone who "appears similar." He's not searching for a beautiful soul, for the Dalai Lama. He's looking for someone who fulfills his fantasies -- not yours, or mine -- his.
Hook-up apps are rife with disembodied cock pics, vainly trying to mislead others about what they'll find after the deception is revealed. As if every user doesn't have a dick, and can judge proportions (or surmise why they've been cropped out) on his own.
If you don't have what he's looking for, you two aren't a match -- for amateurs as well as professionals. Not every two people are. Lying or misleading won't change the other's desire, just leave him disappointed by the bait-and-switch.