M.M.
Hi K.,
Well, my kids are 3 & 4 and while I don't have those issues yet, I really sympathize with you!
Being open and honest is best, and like you have said, you have been. Maybe a little "refresher" in the sex talk to keep it at the top of his mind will help.
With being the first girlfriend he's experiencing SO many new emotions and feelings and I think it would help to talk to him about all that (if he's willing).
I completely don't blame you for being weirded out. I would be the same way! (Thank god my son is still in the "mommy, i'm going to marry you when I grow up" phase-haha)
I think what's best is to refresh his memory on the sex talk and maybe a little reminder to NOT be swapping spit in front of the whole family. Although, you really don't want him doing it OUT of your site either, but maybe let him know that it's not really appropriate to "make out" right in front of everyone.
I think leaving the door open is a SMART desision as well. It shows that you are firm but understanding. I wouldn't want you to be the overbearing mom either.
I think you are doing a great job! And, it's Friday, go get yourself a margarita to calm your nerves!!
Hope you have a wonderful (kiss free) weekend!!
M.