Debate over Marriage and Sex

Yesterday I was going with my friend and discussing about sex and marriage. He has spent night with many girls,and he is bachelor and suddenly asked the question. Have you sex with any girl apart from your wife ? My answer was No! He was suppriesed after listening this answer.Then we started debate over this topics. I asked the question ,when you would get marry ,could you answerable to your wife,when she will ask the question ,have you any sex life before marriage.Then what would be your answer honestaly.He get started thinking over this answer,agin I asked the question ,have you sex with a carl girls.He answered me yes.Then again I asked the question ,have done sex with such a carl girl when you astonished over the girl,who was not looking earlier as a carl girl. His answer was Yes . Then I asked the question imagine when you get married such a girl who has relation with other before the marriage, could you accept her? His answer was so supprising . COULD YOU GIVE ME THE ANSWER WHAT SHOULD BE?
The GOD has given us valuable life and in which he has arranged a plan for Marriage with condition and that condition we take OTH to LIVE a honest life with partner. But where we are going in which direction. GOD knows better perhaps it is from our beyond of thinking