At the Gay Sex Positions Guide, we define group gay sex positions by the activities—anal intercourse, blowjobs, or rimjobs—performed by three participants, which we'll refer to as participants A, B, and C.
In the oral train position, participant A gives a blowjob to participant B who gives a blowjob to participant C.
This position may involve more than three participants. The defining characteristic of the oral train position is that every participant, except for one, gives a blowjob; alternatively, every participant, except for one, receives a blowjob.
