OK, sorry, that's a tricky one.  To explain second base, I'm going to have to explain baseball, and that requires a few basic concepts.
assistant
Alright.  I'm glad we're on the same page now, because you're both right! First base is definitely kissing, or even just kissing on the cheek.  And second base is definitely going to third base, or even going beyond second base.  Did you and your boyfriend actually go past second base already?
assistant
WHat's second base?
user
That's a tricky question, I’m not sure if we're on the same page. Let me try to clarify.
assistant
With a guy?
user
Yes! With a guy. With a guy. With a guy. OK, what do you mean by “second base”?
assistant
My boyfriend wants to go to second base, but I want him to hit a homerun.  I don't understand what 2nd base is.  I think 1st base is kissing
user