Researchers questioned more than 2,000 married individuals about their relationships, and asked them when they started having sex. Analysis of the results suggested there were rewards for not getting physical too fast. Compared with those having sex early, couples who waited until they were married rated the stability of their relationships 22 per cent higher. They also claimed 20 per cent increased levels of relationship satisfaction, 12 per cent better communication and 15 per cent improved "sexual quality". The findings appear in the Journal of Family Psychology.