We only have gay guinea pigs in our house. They are all only interested in each other but yes they do watch you get changed...
I think they are confused. I imagine their thought/conversation goes something like this....
Merry - Here they go again... it's fur changing time...
Suilven - Why does Mummy 1 and Mummy 2 change their fur before snuggles in bed?
Merry - I don't know but they always do. Sometimes they change their fur during the day too!
Angus - But I like cuddling under their fur but I get told off for being scratchy... Hamish doesn't mind when I cuddle him though, can I get under his fur?!
Hamish - I like their big comfy fur best. They wear it when they are cold and the heating isn't on. It's great for cuddles.
Suilven - I still don't understand. We always have fur. Why do they take theirs on & Off?
(4 pigs sit in quiet contemplations.... staring at their mummies.....)