Thanks, Gavin.
Ours are "at it" regularly. I'm not sure if it's the same two every time and whether they always take the same role, so to speak.
When the chappie came to strim the field, as he left, he gave me a wink and said "I think you're going to have baby pigs soon". To which I replied "If so, I will be able to retire 'cos they're all boys".