I hear ya! No, you're not messed up to say that, cause it's true. Those guys aren't even tied to agencys, I've seen them in all kinds of different videos for other agencys. Imagine that as a job. Getting to bang Rio, Yuma, Acky, Asami, Minori, Yuria, Ai, Shou, Kaho, Aino, Jessica, Hana & Rina (amongst other non-Ebisu Muscats and really hot JAV idols) on a consistent basis. Lucky bastards.
Seems like those guys are always in demand though. In Ai and Shou's radio show, they've mentioned how there's actually a lack of male pornstars at the minute (!!!!) and that they've had experiences where the filming starts later than expected because they had to wait for the male actor in question to finish filming a scene with another girl before showing up to theirs. So it sounds like they film multiple scenes in a day. Lucky, lucky, lucky, lucky bastards.