PROG BANDS AND THE LIKELINESS THAT THEY HAVE SEEN EACH OTHERS’ DICKS:
ELP: Confirmed, multiple occasions.
Yes: Ranges depending on the line up, but generally Unlikely. Probably peaked in likeliness while the first line up lived together.
Genesis: For Peter, Tony, and Mike, Extremely Likely. For Mike and Phil, also Likely (they’ve def explored each others’ bodies). For everyone else, Somewhat Unlikely.
King Crimson: Depends on the line up, but overall I’d say Likely. They’ve probably all seen Fripp’s at least as some sort of intimidation ritual. It is Confirmed that Adrian has seen Fripp’s (he showed it to him).
Rush: I mean. Alex and Geddy have known each other since they were preteens. And their first tours were in a fucking rental station wagon and they shared hotel rooms. It is Extremely Fucking Likely they’ve seen each others’ dicks. In fact I’d say it’s safe to assume they have.
Van der Graaf Generator: This one is more based on vibes and the little osmosis I know about them, but I’d say it’s Likely they’ve seen each others’ dicks.
**BONUS**
Rick Wakeman’s English Rock Ensemble: They all pissed into a bathtub together for the opening of No Earthly Connection iirc. So that is also Confirmed.