It doesn't matter if the two newlyweds don't particularly care whether the bed can be used by others, because young people nowadays are more open-minded and think that traditional habits used to be superstitious. As long as we help each other after marriage, we can be happy and last forever.
Some young people, especially girls, may be obsessed with cleanliness, and after being slept by others, their beds will feel uncomfortable, which involves personal hygiene. Some people may feel unsanitary, so they will be very uncomfortable. If so, I suggest you change it to a new four-piece suit.