Fountain of youth vagina?😂💦

Ok so me and my boyfriend had amazing sex on our 5 month anniversary and when we were done we laid there for a while cause we were both tired ☺️

And all of a sudden he goes „was I harder than usual? My dick is sore“

And I was like idk you’re always hard.

But then he goes „but it was so hot you were so wet as you came I thought I found the fountain of youth!“ 💦

Is that just imagery or does this have another meaning I don’t understand? Help?