The one-night stand incident just write "John/Mary Doe" See if they notice. You should be okay and get away with it.
Group sex with socks on is perfectly decent, if not a little bit domesticated and tacky. Not exactly sexy is it? I mean jeez! It would preferable if they had all left their hats on also so just pretend they did and don't consider this a perverse event.
The Shetland pony one, I'm not so sure about. What colour was the pony?