Ok, let me baby-step you through it:
-It's a bathing scene.
-You'd normally expect naked women.
-Chisame is having her naked bathing scene as she goes through her monologue.
-Suddenly, FULL FRONTAL MALE NUDITY
It's humorous in the context, specially when it's a quick jab with no more purpose than to ease the previous train of tought that was getting Chisame over-worried and facilitate a change of subject.
Of course, since you're a retard troll fixated on every fucking detail and taking this shit way too fuckings eriously, it must go over your head.