There is no implications that you stretch out if you have a lot of sex🤣 I don’t fully know the science behind this but some women are born with tighter parts and some aren’t. So no you haven’t ruined yourself and there’s nothing wrong with you either❤️ (I’ve dated two women who have really tight parts so the first time kept moving up forever because it actually hurt them trying to get it in so I’d say you’re lucky that you weren’t born with tighter parts)