lie a bit and tell her yes.

"Yes, of course. I've been around" you said.

That sounded weirder when spoken out loud than it had in your mind.

"Oh." Lisa exclaimed. "Around? How many relationships have you been in?"

It was too late to back down now.

"You know, a gentleman doesn't really talk about these things. How about you?", you tried to turn the tables, even though that was not gentleman-like either.

Lisa looked at you and she smiled coyly.