but seriously, in the original, they did kiss. and consummate their marriage. i've studied this book a lot. and read versions where they actually put in the stage directions, which include kissing at that part.
105 ROMEO
Then move not, while my prayer’s effect I take.
Kisses her
Thus from my lips, by thine, my sin is purged.
JULIET
Then have my lips the sin that they have took.
110 ROMEO
Sin from thy lips? O trespass sweetly urged!
Give me my sin again.
They kiss again
JULIET
You kiss by th' book.
which means
You kiss like you’ve studied how.
if you want just one example of the stage notes
http://nfs.sparknotes.com/romeojuliet/page_66.html