Okay, we gotta have a thread for all those who appreciate the male side of the equation.
Were I so inclined, I’d have to go with Mal. In the interest of full disclosure, I am most like Wash in actuality.
You’d have to go through me to get to him! 
Already weighed in on the distaff side of things…
Simon, then Wash.
Mal’s not unattractive, but not my type.
Jayne, while he cleans up nice, is a little beefy for my taste, and absolutely repulsive, personalitywise.
Book…Book… I like Book, but mostly think he’d be cool to hang around with…somehow being attracted to a celebate priest (I fully believe he’s honestly taken up the cloth, although he’s cagey about his past before that) just doesn’t seem right.
Haveta say Mal. Then, probably Simon, followed by Wash. And Jayne could be the last male in the universe, and I still wouldn’t pick him. I find him repellent both in his personality and his physical appearance.
Mal, definitely. He’s got the sarcasm. And the tight pants.
I’d also go for Wash, but his wife would kick my ass…
Jayne, but only if he promised not to talk. Adam Baldwin is much the hottie.
Then Simon, Mal, and Wash (much as I love Alan Tudyk). Book is too old for my taste, and I agree with River that his hair frightens me. :eek:
Mal, no doubt about it. I find him unbelievably appealing. MmmmmmCaptainTightpantsmmmmmmmmm
Then Wash, then Simon, and then Book. Jayne, as mentioned by others, is just too repulsive.
Mal
Jayne
Wash
Simon
I’ll be in mah bunk.
Mal
Wash
Simon
Book
Jayne
They’re all pretty hot, in their own way. Even as repulsive as Jayne can be, he was actually kind of sweet, in a perverted sort of way, to the hookers in the episode Heart of Gold.
Simon
Wash
Jayne
Mal
There is no Book on my list - interesting guy, but just too damn old.
Wash (if Zoe didn’t kill me with her pinky)
Mal (if Inara didn’t scratch my eyes out)
Simon (if River didn’t implode my skull and Kaylee didn’t give me that hurt look)
Jayne
Hmm, since no one would kill me for sleeping with Jayne, that might be my best bet.