The sound insulation of the house is not good, and it is embarrassing to have sex with BF.

If the walls of the room are thin, there is basically nothing we can do. If it is not because of the poor sound insulation of the wall, but because of the door, you can consider buying thicker curtains, making them wider, pulling them on the whole wall and collecting more discounts. Besides, we can also enclose the bed with curtains to make curtains for the bed.