My boyfriend is very affectionate, (sexually), and we have sex on a pretty regular basis.
This is a concern of mine. The guy I'm with now has a large penis and after some painful experiences in the beginning with our intimacies I've adapted well to his size. I'm worried if we would ever split up my vagina may not return to it's previous size.
Yes, it is normal. A vagina expands to fit the size of a penis. At the end in most cases, the vagina does go back to its normal size. However, increased sexual activity can cause a girls vagina to become loose.