Fun before marriage
First of all it depends on what’s kind of fun we want befor marriage. If its about having good friends done its going to be really helpful even after marriage as it helps us to understand the opposite sex better so we can always know how to make life after marriage better.
If its about sex before marriage then it depends on what kind f sex.if it was with a boyfriend or girlfriend in a serious relationship then it makes you conscious about the mistakes that you have done in your unsuccessful relation and you can avoid dose mistakes in you life after marriage. If its about one night stand or casual sex done it can affect your marriage in noway as its does not involve in emotions and on the other side marriage is more about emotions and feelings rather than crude sex.
So i think until and unless your some freak who just can’t get along with anyone, any kind of fun before marriage must not have an effect after marriage.