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My two BBC OT3s in their wedding gear.
Top is the Eleventh Doctor with Amy and Rory.
By the end of their story it was pretty clear Eleven had become a third party in the marriage, sexual or not, and it was on their wedding day Amy and Rory invited the Doctor to be part of their life together properly. He even loved them enough to live a normal boring human life with them for a year.
And let's not forget that Amy in the comics was rather turned on by the sight of "her boys" kissing.
Then there's John and Mary with Sherlock.
It's very very clear that Mary understands how much John and Sherlock needs each other and she has no desire to get between them. Well, maybe a little, if you know what I mean *wink wink nudge nudge* At the wedding she looks very sad when John and Sherlock won't dance together, and can be seen mouthing to Sherlock "For you" when she has to dance with John alone, so she might understand Sherlock better than John in this area, maybe even better than Sherlock himself.
The bottom picture is inspired by a cute gif-set I saw that made it look like the Doctor danced with Sherlock at the wedding, made all the cuter by the fact that Matt Smith was considered for the role of John before Martin Freeman entered the scene. Matt and Benedict were of course too similar for it to work, but it's practically Sherlock dancing with an alternative John (or two Doctors dancing together, seeing as Benedict was the original choice for Eleven)