LOS ANGELES, Aug 8 — Henry Cavill has a little (ok, we’re not sure about this!) secret to reveal.

The man of steel admitted that while shooting for a steamy sex scene for his Showtime series “The Tudors”, he accidentally got himself into a “very embarrassing” situation.

“It only happened to me once and it was very embarrassing,” the Cavill told Men’s Fitness recently. “A girl had to be on top of me, she had spectacular breasts, and I hadn’t rearranged my stuff into a harmless position. She’s basically rubbing herself all over me and, um, it got a bit hard.”

Cavill, 32, was ever the gentleman, however, and apologised “profusely” to the actress for his involuntary arousal.

Cavill continued, “I had to apologize profusely afterward. It’s not great when you’re in a professional acting environment and somebody gets a boner, is it? No, not acceptable.”

It looks like Superman has his weak moments, after all.