I’ve noticed snails cwtched up together many times in the past but I’d never observed the nitty gritty of what they were actually doing until I saw this pair. Because they’d pulled slightly apart, it was possible to see their ‘apparatus’ in action.
And what about the tiny white spike on the snail at left? Is that one of the love darts that snails stab their mates with? I don’t know enough about snails to be sure but, for more on this point, you can read about the sharp end of snail sex on the National Geographic website here.