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 fuck rim train position, participant A fucks participant B who gives a rimjob to participant C.
| Position \ Participant | A → | B → | C |
|---|---|---|---|
| Treno orale (a.k.a. Blow Train) |
blows B → | blows C → | ◉ |
| blows B → | blows C → | blows D → ⋯ → ◉ | |
| catena orale (a.k.a. Blow Chain) |
blows B → | blows C → | blows A ↩ |
| blows B → | blows C → | blows D → ⋯ → blows A ↩ | |
| Soffiare Rim Train | blows B → | rims C → | ◉ |
| Blow Rim Chain | blows or rims B → | blows or rims C → | blows or rims A ↩ |
| blows or rims B → | blows or rims C → | blows or rims D → ⋯ → blows or rims A ↩ | |
| Perfecta (a.k.a. Blow Fuck Train) |
blows B → | fucks C → | ◉ |
| Rim Colpo Train | rims B → | blows C → | ◉ |
| Rim Train | rims B → | rims C → | ◉ |
| rims B → | rims C → | rims D → ⋯ → ◉ | |
| Rim catena | rims B → | rims C → | rims A ↩ |
| rims B → | rims C → | rims D → ⋯ → rims A↩ | |
| Cazzo treno Rim | rims B → | fucks C → | ◉ |
| spit Roast (a.k.a. Fuck Blow Train) |
fucks B → | blows C → | ◉ |
| Rim Train Cazzo | fucks B → | rims C → | ◉ |
| Anal Train (a.k.a. Fuck Train) |
fucks B → | fucks C → | ◉ |
| fucks B → | fucks C → | fucks D → ⋯ → ◉ | |
| Fuck Chain (not seen to date) |
fucks B → | fucks C → | fucks A ↩ |
| fucks B → | fucks C → | fucks D → ⋯ → fucks A↩ |