History of sploshing /WAM. anyone know?

A Question
Basicaly when did the human race discover the joys of splosh/ wam.
Like a few poeple I know, I have always enjoyed seeing clothed females messed up with guge mud or pies. My first memories are as a five year old in my first school in 1962 seeing a teacher in a very pretty summer dress and I thoght how much I would love to see that lady covered in mud. This was something I kept secret most of my life. it was only later in life 16 -18 years old that I began to suspect this was not just me. After seeing glimpse of wam in the playboy or razzle mags in the early 70's.
It was not untill 1994 when I by chance stumbled on a splosh mag. (thanks Bill) and I subsiquently bought every issue ever since including back issues. and been a contributer ever since.
So it seems I am not alone. however the whole splosh / wam scene has been taken over by the www. mostly (casual wear / nude/ bikinis) not what my Idea of sploshing is, but every now and then a few bits meet my exacting standards.
anyway back to my question. When was the first recorded instances of humans enjoying wam. was it the Romans? greeks? or is it just a 20th century thing.
I gather we had it in our genes anyway hence the pie fights gungings etc in the very eary movies of the (1920's)
any input appreciated
Basicaly when did the human race discover the joys of splosh/ wam.
Like a few poeple I know, I have always enjoyed seeing clothed females messed up with guge mud or pies. My first memories are as a five year old in my first school in 1962 seeing a teacher in a very pretty summer dress and I thoght how much I would love to see that lady covered in mud. This was something I kept secret most of my life. it was only later in life 16 -18 years old that I began to suspect this was not just me. After seeing glimpse of wam in the playboy or razzle mags in the early 70's.
It was not untill 1994 when I by chance stumbled on a splosh mag. (thanks Bill) and I subsiquently bought every issue ever since including back issues. and been a contributer ever since.
So it seems I am not alone. however the whole splosh / wam scene has been taken over by the www. mostly (casual wear / nude/ bikinis) not what my Idea of sploshing is, but every now and then a few bits meet my exacting standards.
anyway back to my question. When was the first recorded instances of humans enjoying wam. was it the Romans? greeks? or is it just a 20th century thing.
I gather we had it in our genes anyway hence the pie fights gungings etc in the very eary movies of the (1920's)
any input appreciated