The shell stays on during sex, also he likes it rough - I hope you don't mind! A picture I did last in 2024 for Bowser day, had artist's block so I didn't draw the pic I wanted to this year. 

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ALT Text: Bowser, A.K.A. The Koopa King, a reptilian turtle-like creature with fiery red hair and spiked belts on his arms, legs, and neck lies backwards on a bed, facing the viewer. His hands lightly grasp loose sheets as he hangs his head upside-down just above the floor. His legs are spread, pulling the loose sheets further down the bed, exposing his erect member. Smokey breath emerges from his open mouthed grin, super heated by his excitement - "Come... your ravenous king waits! Conquer me, and be rough, that is an order!" he declares, patiently awaiting your next move...