Men with dirty bums are doing my head in at the moment.
I know what you mean. Had one recently who claimed to have showered prior to arriving. Laid on his front for a massage and the stink from his bum hit me, it was disgusting, made me feel sick.
It seems that it doesn't occur to many men that they actually need to clean their arse using a soap product.
I have come to realise that what these men consider cleaning themselves properly and being clean and fresh is poles apart from what we consider that to be.