Referres to a sexual position involving 5 or more people standing in a line connected to each other in a sexual way
Hey,Nick, call Cassie, shanna, joe, and eric so we can have a sex train!!
a girl is on the bottom and there is a guy fucking her and then there is a guy fucking him up the ass and another guy fuckng him up the ass on so on and so fourth.
cindy,john,bob,joe,and jared just did a sex train