Tingling while working out? ?

So I just got finished working out and while I was doing leg lifts and flutter kicks (both core workouts) I got a tingling sensation in my private parts. It wasn't uncomfortable, actually it was really pleasurable. I also get this feeling when I do the flex arm hang (when you do a pull up and stay in the up position for as long as possible). Has this happened to anyone else? What is it that is going on?