Re: Did the BBC just troll people?
"Some reptiles, such as I thing Crocodiles, can hold their breath for amazingly long periods"
Except Crocodiles aren't holding their breath. They simple not breathing and building up an oxygen debt in their blood. Crocodile blood is also known to be very efficient at storing oxygen AND their muscles happen to work well even with low oxygen. The point being their lungs have nothing to do with it. An equivalent practice would be like divers hyperventilating before a long dive. The capacity of the lungs hasn't changed, just the amount of oxygen in the blood.
I found the kiss to be jarring, not because of some homophobic agenda but my suspension of disbelief finally broke that a lizard could transfer oxygen back out of its blood and into its lungs in order to then breathe that oxygen into a human. I'm with another poster on this one, I think the BBC are trolling (JUST like they did with the panto-like Captain Jack). The kiss didn't add anything to the plot that hadn't already been said MULTIPLE times but was wedged in anyway at the expense of the science.
Science Fiction is at its best when extrapolated from already known science. When you start making things up that outright contradicts our understanding of the world then it stops being science and become magic, which has its place in a different genre.
* OK, I'll concede that 2 sets of lungs are better than 1, and so in that sense the additional capacity would have helped but rather assumes that Lady Vastra hasn't absorbed all of the oxygen contained in them already.