Because when it comes to embarrassment, forgetting to pull up your underwear after using the bathroom is a much better excuse than you just got done having sex.
"Last Saturday, at an outdoor event I happened to find myself desperate for a wee with the toilet cubicles all occupied.
I had also consumed a bottle of wine.
'However, it seems that someone was determined to expose what was an embarrassing moment for me and a dreadful lack of judgement on my part. It was Jonathan who noticed that there was some guy filming me and he tried to pull me away. Regrettably, oh-so regrettably, I had not the time to pull up my rather large pants. I hope I can be forgiven for these antics but, you know, when you’ve gotta go, you’ve gotta go.'
Anyway, like we said, you were at a charity event. Forego "consuming a bottle of wine" and you won't have to pee in the yard.
Or have sex outside.
Or whatever is true.
Point is, this could have been EASILY been avoided with some class in regards to the function.
Keep it under control, gurl!