It is permissible to have intercourse with a virgin on Shabbat. When one has intercourse with a virgin, once he performs the commanded sexual act he should immediately seperate, even if she is a child who is not old enough to menstruate, and she has not mentruated. Nevertheless, that particular sexual act may be completely normally with a 'living member' Even if she inspected and did not find any blood, she is deemed impure, for perhaps a drop of blood the size of a mustard seed was seen but it was covered by semen. She must find herself totally clean and inspect for seven days. She should not start inspecting until the fifth day after intercourse, like any other woman who had intercourse and then menstruated. [Her husband] must interact with her like any other menstruant, as far as the rules of distance are concerned, except that in the case of a genuine menstruant he may not sleep in her bed even is she is not in the bed, and in the case of the bride he may sleep in her bed after she has risen from it, even on the sheets that the blood is on. Rem"a: See (Shulchan Arukh, Yoreh De'ah 193).
Some authorities say that after he finds the hymen [blood] he should recite the following blessing: Blessed are you HaSHem, the King of the World, who watered the nut in the Garden of Eden, [the rose of the valley, a foreigner shall not rule in the sealed wellspring. Therefore the beloved morning star has been guarded in purity, as a law that shall not be forsaken. Blessed is the One who chooses the offspring of Abraham]. Rem"a: Other authorities say that we do not recite this blessing without a cup of wine.