This is what English law says about it:
Section 12 of the Matrimonial Causes Act 1973 provides the ground for a voidable marriage. A marriage is voidable if it has not been consummated due to the incapacity of either party to consummate it. Consummation requires sexual intercourse which is ordinary and complete. On the other hand, a marriage will also be voidable where either party to the marriage voluntarily refuses to consummate it. However, a party may not seek a decree of nullity resulting from his own refusal to consummate the marriage. Where either party to the marriage has not consented to it, the marriage may be avoided. There will be no consent where there has been duress, mistake, unsoundness of mind or otherwise. It is worth noting that Section 13 Matrimonial Causes Act 1973 provides certain bars where the marriage is voidable.