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 |
|---|---|---|---|
| tren Oral (a.k.a. Blow Train) |
blows B → | blows C → | ◉ |
| blows B → | blows C → | blows D → ⋯ → ◉ | |
| cadena Oral (a.k.a. Blow Chain) |
blows B → | blows C → | blows A ↩ |
| blows B → | blows C → | blows D → ⋯ → blows A ↩ | |
| Tren del borde del soplo | 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 → | ◉ |
| Lamer tren Blow | rims B → | blows C → | ◉ |
| Lamer tren | rims B → | rims C → | ◉ |
| rims B → | rims C → | rims D → ⋯ → ◉ | |
| Lamer cadena | rims B → | rims C → | rims A ↩ |
| rims B → | rims C → | rims D → ⋯ → rims A↩ | |
| Rim Fuck Tren | rims B → | fucks C → | ◉ |
| Spit asado (a.k.a. Fuck Blow Train) |
fucks B → | blows C → | ◉ |
| Tren de la orilla de la mierda | fucks B → | rims C → | ◉ |
| Anal tren (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↩ |