Re: hymenoplasty
I do not think this is the case. it is a scientific fact that the hymen can be separated when the body is stretched strenuously, as in athletics; it can be separated by inserting a tampon during menstruation or through masturbation; and sometimes it is separated for no apparent reason.
AA83 why are you thinking about this? I do not see any reason to get worried about such thing unless you are marriying into a really uneducated family who do not know first thing about human anatomy.
I remember once talking to a unmarried pakistani girl who thought a virgin girl will bleed like alot when she first have sexual intercourse because she saw it on some movie. She also said this is the reason brides are given some sort of plastic sheets to cover their beds. This is all Bull. Not every girl bleed during first intercourse and some who do, it is like very very minimal that you can wipeoff with a tissue.
So stop worrying about this and start to freak about your dress and makeup like a normal bridezilla. 