my knees,elbows,back crack themselves when i move,i understand how/why,but…during sex when i am “deep” my penis cracks at the base.its not uncomfortable but how/why does this happen? 
Well, if anyone was going to ask this question, it’s good to see it’s by a guy named poppachubby.
i understand how joints “pop”,but how does that pop?the first time it happened it scared the crap out of me!
OK, I’ll jump on this one and give it a shameless nudge, because this has happened to me as well.
Not for a VERY long time, unfortunately… 
There actually is a bone called the baculum in the penis of most mammals (but not humans, actually, so unfortunately this doesn’t answer your question), according to this thread: Why don’t I have a bone in my penis?
Maybe there is erectile tissue extending back into your body far enough that it can “crack” against some other bone?
Though I guess he doesn’t address this particular issue. Never mind.
still thats not quite the answer…what is it and is it dangerous,can i break it? :eek:
When Loveline was running on MTV in the late-90’s this question came up at least once (if not more often). Dr. Drew said that there is a joint that can pop, just like in your fingers, elbows, knees, etc. From what I remember, he said there’s nothing to worry about. (Usual disclaimers apply.)
thanks i guess that answers my question
Pops for me too on occasion. Everything still works fine, so if it ain’t broke…
I would have to say it would scare the crap out of me if my junk popped. Did it freak you out the first time?