i've done exactly what you're enquiring about n i have to say it depends all on the girl as to hw it will b "the morning after." in my personal experience she took it well (pardon the pun) and we remained cool after it.
dnt hold me to this becuase i may have had a freak experience, but think of it this way... do u wnt to end up moving out 1 day n thinkin, y didnt i go for it?

Ritz