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 |
|---|---|---|---|
| 구강 기차 (a.k.a. Blow Train) |
blows B → | blows C → | ◉ |
| blows B → | blows C → | blows D → ⋯ → ◉ | |
| 구강 체인 (a.k.a. Blow Chain) |
blows B → | blows C → | blows A ↩ |
| blows B → | blows C → | blows D → ⋯ → blows A ↩ | |
| 타격 림 열차 | 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 → | ◉ |
| 림 페라 기차 | rims B → | blows C → | ◉ |
| 림 기차 | rims B → | rims C → | ◉ |
| rims B → | rims C → | rims D → ⋯ → ◉ | |
| 림 체인 | rims B → | rims C → | rims A ↩ |
| rims B → | rims C → | rims D → ⋯ → rims A↩ | |
| 림 Train 열차 | rims B → | fucks C → | ◉ |
| 로스트을 뱉어 (a.k.a. Fuck Blow Train) |
fucks B → | blows C → | ◉ |
| 망할 림 기차 | fucks B → | rims C → | ◉ |
| 항문 기차 (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↩ |