I remember when I was working at Motor Dealers, Toyota Corolla GT, B-reg or so, brand new at the time yellow with black bits, like a bee, nice looking trachko. MD's son (a salesman at the place) took a lass out in it and bonked her in the back seat leaving a quite impressive spunk stain. It really was massive!
Cloth seats, valet couldn't get it out (or wouldn't go near it!).
MD was livid, 'I can't sell a car with spunk all over it....'
None of us would go it in if it meant the back seat!
Ended up being said son's demo car, in the end I bet some poor unsuspecting sod bought it with 'slight soiling on rear seat'.....