Mores are rapidly changing: living together, having a child outside of marriage or even with the father around, divorce, all used to be shameful. Until recently, if the woman who you are marrying wasn't a virgin (to you), it was not to be mentioned. Now people invite their ex-lovers to their weddings and stay in touch. Perhaps not many married couples practice any form of nonmonogamy (swinging more common than cuckolding), but a fair percentage have it in their past, from college experiences. In the future, couples will be open about their secondary relationships. Perhaps you don't want to admit that you're not as special as you once were.