There is more to marriage and intimacy than having Sex before marriage can proffer. There is a lot that can change about relation once sex is involved. sexual intimacy can always come after marriage, doing so helps build respect for both parties such that people do not just take advantage of you sexually and then walk away.

If you want to use sex to test compatibility, and in the long run the relationship crashes, how many persons will you do that with before you find a sexually compatible partner? it is not too difficult to adapt to individual sexual fantasies even in marriage. it is only an issue when one of the parties has a lot of body count and experiences while the other has none. if both parties are chaste, there wont be any serious issue with waiting till marriage before considering sex.