I personally think that good hygeine is essential, however if the guy arrives and smells well and asserts that he had a shower before arriving, then that should be cool with the lady

I have at times thiought the shower is to reduce the length of time of an appt.

One lady I was with asked me to have a shower before hand, I did, I told her after I wanted a golden shower which we did in (you guessed it) the shower, she gave me a quick shower down after the fetish and then after the fiull session I had another shower,
Actually one before I met her too and one when I got home, so six in an hour.