Exmo here, I highly doubt it. There are rules against lesser forms of intamacy (petting), also this clearly violates the spirit of the law (of no premerital sex).

I could see it happening but any Mormon worth their salt would raise their eyebrow and deny it. This is on the level of holding a knife in the middle of a street and getting somebody to bump people into you, it's not murder, right?

If you wanna talk crazy let's talk about how you can figure out somebody's secret name if you know the first time they went through temple endowment. Or how bigfoot is technically canon.

It's just another version of oral/anal doesn't count.

It's real. How widespread it is, that's the question. Anecdotally I personally know of three real life instances of this, and several alleged.