After the initial embarrassment they both go to sleep, the woman on the top bunk, the man on the lower.

In the middle of the night the woman leans over and says, "I'm sorry to bother you but I'm awfully cold and I was wondering if you could possibly pass me another blanket."

The man leans out and, with a glint in his eye, says, "I've got a better idea ... let's pretend we're married"

"Why not", giggles the woman.

"Good", he replies, "Get your own fucking blanket!"