Group sex includes any porn video with three or more participants and the numbers can get enormous. When you have more than six people it is usually referred to as an orgy as the increased number of persons gives the proceedings a wild feeling.
The best Japanese AV features Nanaka Kyono, a uber-sexy Asian cutie who is known for her powerful climaxes and sultry sexual encounters. Wow, Nanaka Kyono sure knows how to give a bj like nobody's business.