Can you "catch something" by kissing?
Yes you can -- anything from just a cold to
a pretty serious sexually transmitted
disease. Also, since the AIDS virus has been
found in the saliva of people with AIDS, it
could be transmitted by kissing someone who
has the disease, especially if you have any
cuts in your mouth.
There's no such thing as 100% safety. But
if someone has a cold or the flu, wait until
it's over. If you see he's got sores on his
mouth or lips, stay away! Also, if you have
cuts in your mouth, or he does this increses
your chance of passing on infection.
I don't want to make you paranoid, but just
to tell you there's no such thing as "safe kissing"
so keep that in mind.