"Never said I'd never had sex," he pointed out. "Just that it's rare for me to. Trust me, I've field-driven that one."
Something about the entire conversation was making him self-conscious - an unusual feeling for him, granted. Matt tended to do exactly as he pleased and damn the consequences, but something about the way she was looking - the way she was taking this seriously - he realised he couldn't explain that this wasn't crossdressing, exactly. It was more complicated than that: he'd bought the dress with the same selection criteria he offered to shirts. If he liked it, it was worth purchasing. If he didn't, it wasn't.
Somehow, he didn't think that was a distinction she'd get, and it wasn't one he wanted to make. Instead, he picked up his jeans, pulling them on easily.