Why do we use white bedsheet on first night?
According to the custom, a bride's virginity is tested by looking for blood stains on a white sheet after the wedding night. The sheet is checked by the family and the groom has to declare before the elders whether the bride is a virgin.
The purpose of the ritual was to establish the consummation of the marriage, either by actually witnessing the couple's first sexual intercourse, or symbolically, by leaving before consummation. It symbolized the community's involvement in the marriage.
"If it's a regular partner, change the sheets at least once a week—and more if there's been obvious soiling," Kim Langon, MD, an OB-GYN at the family wellness site Parenting Pod, told Health.
The white sheet has a very important meaning. It is a virginity tester. By this I mean when the couple have sex for the first time on their wedding night and the bride is a virgin, she will bleed and the blood stains the sheets. The sheet is then shown to the family members for them to confirm the bride was a virgin.
As was told to us by Vivek, the virginity test ritual is to check whether the bride is a virgin or not. In the name of this ritual, the groom is given a white bedsheet to use while having sex with his just-married wife on the wedding night.
White is a neutral colour and has a calming effect, invoking a sense of comfort and serenity in the room. If you red bedding in your bedroom, a colour that's associated with being alert, it can have the opposite effect of heightening your stress levels when you're supposed to be in a room that's meant for winding down.
The Amish wedding night will usually be spent in the bride's parent's home, as the couple will need to assist in clean up the following day. They will then spend their first months of marriage – their honeymoon – visiting relatives. (This is when most gifts they receive will be given.)
The yichud is a ritual performed during a Jewish wedding immediately after the couple is married. The couple spends a few minutes in a room by themselves away from their family and friends. In biblical times this is when the marriage would be consummated.
Just like many other areas in marriage, sex and its frequency also require compromise. But studies show that a weekly frequency is good enough to keep your marriage happy.
Technically, a sexless relationship is defined as when a couple has sex less than once a month or less than 10 times a year, says Dr. Epstein. What does that mean for your relationship?
How often do married couples make love?
Average number of times per week married couples make love
25% had sex once a week. 16% had sex two to three times per week. 5% had sex four or more times per week. 17% had sex once a month.
White sheets are one effective way for hotels to prove their standards of cleanliness. Much like how the wealthy used to wear all white to show that they could afford to keep it clean, hotels use all white linens to show luxury. (Although, admittedly, even less luxurious hotels use white sheets.)

The magic of white
Colored sheets were seen as more manageable and easier to clean, because they could hide stains. Then, the Westin's hotel designers researched what a luxury bed meant to them and their guests.
Let me tell you the reason. There is scientific reason for decorating beds with roses; essence of roses relaxes the tired mind of the bride and groom after the daylong event. Aromatherapy specialists, said roses are seductive in nature and can help bring calmness to your mood.
They Make It Easier to Identify Injury
White hospital linens make it easier for nurses and other medical staff to swiftly identify issues with their patients. White healthcare linens are the quickest to visually reveal bleeding or other bodily fluids and injury coming from a patient.