I read that Sir Richard Branson felt compelled to tell the world that he is a member of the mile high club. Too much information Mr Branson - I suggest you stick to making your pickles.
Now if you want the real thing look no further that the 'avian mile high club' as demonstrated by the wonderful swift (Latin name Apus Apus.)
The swift has short legs which aren't much good for walking - so it doesn't bother. Using it's sickle shaped wings and streamlined body it does everything ON THE WING including feeding, socialising and mating . You've probably heard them screeching and screaming out to each other while they fly around in gangs over the fields and rooftops.
The swift is 'a restless spirit on an endless flight' - the Flying Dutchman of the bird world.
So if either Richard B or mj is looking for a 'novelty shag' I suggest they borrow some hang gliding equipment and try the real thing - apus apus style.