I personally think it is. Not only does it serve no real purpose, other than some religious conventions, but it can actually be quite detrimental.

To highlight what I mean, let’s say that you and your partner decide to wait until you get married to have sex, but your partner is into hardcore BDSM. Since the two of you are not having sex, your partner is simply watching porn and fantasizing about engaging in BDSM, but you don’t find this out until after you are married. This partner has sex with you, but it’s not the kind of sex they want to be having. What happens now?

Generally one of these things will happen:

Your partner confesses that they have this fetish, and they are very lucky, because you have this fetish, too. You both get to be happy. Your partner confesses they have this fetish, and you do not, and are unwilling to engage in it. Your partner remains totally unsatisfied in their sex life, and they decide to either a) go without it, and be unhappy, for the rest of their life, or b) they end the relationship. Discovering if you and your partner are sexually compatible before you agree to a life-long partnership is generally a good idea. The last thing you want is to marry someone, then find that the two of you are totally sexually incompatible, and the two of you just end up completely unhappy with your sex life, or end up getting divorced. If you had agreed not to wait, these types of problems could have easily been avoided, sparing you both a lot of time, unhappiness, and heartache.