I know its cruel but...
Last year I was asked by a worried, totally novice couple at a party "Whats this dogging sex thing?"
Being a piss taker I could not waste such an oppertunity..
"well guys if your going to have a go try a large dog...something like an old English sheep dog...small dogs like whippets run like the wind and when you do catch em the snappy little buggers will probably nip your bits"
Paused to enjoy the look of horror on their face's...
They forgave me and are now good friends of Jax and I.