I've mentioned this in another thread, but anyway, it's still relevant.
I was seeing a male friend out of my house one evening, he'd been round to pick something up, and stopped for a cuppa. We're on light cheek kissing terms.
While I was talking to him, I was thinking of my then boyfriend, who lived a 100 or so miles away, and I wasn't seeing him for a week, and was missing him a lot.
So as I was seeing male friend out, while thinking of boyfriend, I gave the male friend a full on smacker on the lips. Uncomfortable.
That was me in my own home defaulting to automatic, god only knows how hard it must be for the dancers not to get automatically touchy freely. Plus they've spent weeks now in very close contact. I don't read too much into their clinches.