"Bone of Steel" joke

Bill goes to visit his doctor on his birthday, a look of concern quite evident on his face. The doctor says, "Hey there, Bill. What seems to be the problem?"

"Well, Doc," Bill replies, "It's a little embarrassing.

You see, when I was 14, my erections were like solid steel... I couldn't bend them down or from side to side."

The doctor nodded.

"When I was 24," Bill continued, "I found I could bend my erections down just a bit."

The doctor nodded.

"When I was 34, I found I could bend them a couple of inches down, and at least an inch to either side."

The doctor nodded once again.

Bill went on, "And now that I'm 44, I find that I can bend my erections almost all the way down and side to side. So, Doc, I'm really worried, and I have just one question to ask you."

"And what would that be, Bill?" replied the doctor.

"Doc," Bill asked, "Just how much stronger am I gonna get?"