Each young woman’s turn came to go in to King Ahasuerus after she had completed twelve months’ preparation, according to the regulations for the women, for thus were the days of their preparation apportioned: six months with oil of myrrh, and six months with perfumes and preparations for beautifying women. Esther 2:12

If King Ahasuerus lived today, the women would line up to file sexual misconduct charges against him.

First was the year-long preparation to “beautify” each woman – six months with oil of myrrh, and six months with perfumes and preparations for beautifying women. Esther 2:12
Second, in the evening she went, and in the morning she returned to the second house of the women. Esther 2:14
These women are called virgins in Esther 2:2, 3 and given to Hegai the king’s eunuch, custodian of the women. Esther 2:3
After their presentation to the king, it says they go to the custody of Shaashgaz, the king’s eunuch who kept the concubines. Esther 2:14
I believe as part of the “interview” the woman spends the night with the king. She is then no longer a virgin but a concubine.

Hadassah (Esther) would also undergo the same treatment. However the young woman pleased [Hegai, the eunuch], and she obtained his favor; so he readily gave beauty preparations to her, besides her allowance. Then seven choice maidservants were provided for her from the king’s palace, and he moved her and her maidservants to the best place in the house of the women. Esther 2:9

When presented to him, King Ahasuerus treated Esther different from the other women he slept with. The king loved Esther more than all the other women, and she obtained grace and favor in his sight more than all the virgins; so he set the royal crown upon her head and made her queen instead of Vashti. Esther 2:17
As a Jew, Esther would have viewed sex before marriage as a shameful act, yet, refusal of this king could result in death.
Perhaps God protected her with beauty so the king loved her at first sight. She did obtain grace and favor in his sight.

This is the way God loves us – at first sight. We obtain grace and favor in His sight and He makes us a chosen generation, a royal priesthood, a holy nation, His own special people, that you may proclaim the praises of Him who called you out of darkness into His marvelous light; who once were not a people but are now the people of God, who had not obtained mercy but now have obtained mercy. 1 Peter 2:9-10