Ahhhh... my partner just left for his Sunday morning bunch training ride and as I was helping him and my son sort breakfast, bars, water/glucose water etc etc i asked about m/f TTs.

He said, "you mean 2-up TTs?"

I said... "I dunno, I guess"

He said he didn't know of them happening here in Middle Earth, but overseas they do 2-up TTs and the second person across the line is time recorded for the pair.
So I guess it works like a team TT, but with only two. He wasn't aware of m/f - husband/wife teams as an event. But in much bigger countries like you all have, you're bound to find one in yours!...