I know people tend to get in the mood at any time, but...SPOILERS!
To get in the mood shortly after seeing your captain splayed out on the floor, ribbons of hideously altered genetic material jutting out of his head and body in a sort of macabre spider's web...that's just dandy.
It was the pear brandy. I know. It makes people tend to do things they wouldn't normally do...BUT COME ON! Are we really supposed to believe that they would get it on after experiencing that, along with knowing that in around seventeen hours they will have an eleven minute window in which everything will have to go perfectly in order for them to survive? Talk about pressure. Nick must have had nerves of steel, along with something else of steel. The rest of the male half of the human species probably wouldn't have been quite as excited, to say the least.
If your nose runs and your feet smell, you were built upside down.