Praise be to Allah.
Shaykh Ibn Baaz (may Allaah have mercy on him) said:
Undoubtedly repeating Hajj brings great virtue for both men and woman, but in view of the great crowding in recent years, because means of transportation have become easier, and people come from all over the world, and travel has become safer, and because men and women mix during tawaaf and in the places of worship, and because many of them do not avoid causing fitnah – we think that not repeating Hajj is better for them, and safer for their religious commitment, and less likely to cause harm to the society which may be tempted by some of them. Similarly men should avoid repeating Hajj frequently, so as to leave more space for the pilgrims and to reduce the crowding. We hope that their reward for not doing it will be greater than the reward of Hajj, if this is the intention.