A) The more sexy women on the covers of books, the better.

B) However, if it's just there for shelf-appeal and does not reflect the contents of the book/movie/etc. I am disappointed.
I yearn for the good old days of trippy, surreal Richard M. Powers covers.
SciFi is strongly sex-free, at least in TV/movies. It is relatively rare, IME, in written SciFi too. On behalf of many fans of the genre: THIS MUST CHANGE!!!
* * * * * *
I might have read some Poul Anderson in the past, but honestly, I cannot remember ever being that impressed.
I guess my tastes in the genre have changed. I'm tired of the dark, gritty stuff, and not interested in the
Star Wars stuff, but instead returning to the pre-SW genre of tail-landing rocket ships and square-jawed spacemen who rescue helpless females (whose own suits are delightfully skin-tight) from evil, bug-eyed, gelatinous aliens.
I'm starting to get into rewatching 50's SciFi flicks (
Destination Moon, Conquest of Space, When World Collide, Rocketship X-M, etc.), and reading the string of Heinlein juveniles for research/inspiration for a retro-Traveller campaign. I don't know how influential they were for CT, so I may have to alter ship design rules and other things (like removing jump tech, keeping things solely within the Sol system, frex).