Why didn’t my friend’s wife care about using the toilet in front of me whilst I was shaving at the sink?

I’m staying with my friend and his wife for a few weeks until my house has finished being renovated, long story short about 10 minutes ago I heard a knock on the bathroom door and I said yes as I would usually do and I heard my friends wife ask if I was in the bath and I said no just shaving and she came in, pulled her panties down, lifted up her skirt, sat on the toilet and took a leak in front of me, wiped then go up as if nothing happened. Am I a bit prudish or should that sort of thing be kept for a husband’s eyes only?