Celaeno is an immortal killer harpy whose three ginormous breasts play absolutely no crucial role. They don't squirt cursed harpy milk or whatever. They're mainly there because a) multi-breasts are unnatural and therefore horrifying, and b) this was a Japanese co-production. Metalocalypse and Angel didn't really have an excuse for showing female monsters/demons with at least 50% more chance of developing breast cancer either, but they did it anyway in the episodes "Girlfriendklok" and "Couplet," respectively.
So this fear of multiple breasts must be because they're "unnatural." And you know what else is unnatural in Hollywood, where most sex boils down to stale missionary between Instagram celebrities? Sex work and stripping, as any prostitute or stripper in a fantasy movie is apparently legally required to spend a fortune on bras.
That's the memorable sex worker from Total Recall. And if you think that this kind of thing is relegated to cult classics from 1990 and couldn't possibly show up in, I don't know, the most popular science fiction thing in the history of ever, may I remind you of Jabba's dancing slave Yarna d'al' Gargan from Return Of The Jedi. On the other side of the aisle, Trekkies got their fix with the cat girl dancer from Star Trek V: The Final Frontier.