Her reaction makes him blink, surely she finds nothing wrong with being naked, does she? He looks down, wondering if something about his appearance has offended her - but let's be serious that simply can't be!

"Have you never seen a naked man before? I apologize for startling you!" Rider grins. "And be not afraid, it's not every man that's as...large as the King of Conquerors."

...yes, he has chosen now to brag about how well-endowed he is. You can't be as tall as Iskandar without everything else being in proportion. "There is nothing wrong with the naked body! In my time it was flaunted! I'll never understand what your time finds shameful about nudity!"