Nikah is the religious marriage contract between man and woman after reciting it between them, they become husband and wife. Sexual relationship between them depends on the mutual understanding and agreement between them. Usually, there is an understanding that sexual relationship starts when both live together after wedding and not before that. Same also about the responsibility of the husband to spend on his wife, starts when they live together.
Nevertheless, if she agrees to have any sexual relationship or sexual act between her and her husband after Nikah, it will be allowed.
It is advisable to keep the intimate relationship limited and avoid full sexual intercourse until they live together.