Do you think Anna and Hans had sex during the 'Love is an open door' song?

Well, she did ask him to, “take me up the North mountain.”

Absolutely not. This is a kid's movie. Quit inserting sex where it doesn't belong. If you had suggested Simba and Nala did it during "Can You Feel the Love Tonight," I would probably say yes. But considering Anna's a sheltered virgin, and she and Hans were in a mostly public place, the chances of them going off to do it during a song is very low.

Hans is gay, so no.