"Rear-entry" refers to a type of vehicle design where the entry point is located at the back, allowing passengers to access the interior from the rear rather than the sides. This design is commonly seen in vehicles like vans and SUVs, where the rear doors or hatch provide easy access to the cargo area and seating. In the context of sexual activity, "rear-entry" describes a position where one partner enters the other from behind. This position can offer different angles and sensations, making it a popular choice for many couples. It is important for partners to communicate and ensure comfort during this activity.