Pseudonymous Kid's first kiss

In honor of Freedom to Marry Week, this story:

PK came home the other day from TaeKwonDo, which he went to with the 13yo girl across the street (who has started babysitting three afternoons a week after school, gracias a dios!). After she'd left, he said to me, "um, Mama?"
Me: Yes?
PK: You know Tai?
Me: Your TKD friend, yes.
PK, whispers: We kissed each other today.
Me: You did?!?
PK, a little embarrassed, a little proud: Yeah--he kissed me first, and then I tried to kiss him, but he wouldn't let me, but then I kept trying, and eventually I did.
Me: Well, good for you boys. Why'd you do this?
PK: To embarrass each other.
Me: I see. Did anyone notice?
PK: No, I don't think so. Tai said he was going to tell, but then he didn't.
Me: Well, cool. I'm glad you boys like each other.