I will not say pre or post marriage sex is important for anybodies life. It is a desire, every individual has their own capacity to control just like feeling of hungry.
If anybody (male/female), who not satified with their present sexual life, They are searching out for it.Finally I will say this hurts when anyone partner come to know about the illicit relation.
After marriage any parter they will not disclose their past sexual relation, you want to know the reason becasue still our society or us not accept.