I wouldn't be offended at all, since I hear many women complain about the average man's hygiene.
Considering that the provider and I will be orally exploring each other's bodies very intimately I would be horrified to know that my hygiene was not as close to perfect as I can get it. So I personally treat every visit with a SP like a date, and I worry about my hygiene to the point of nearly being OCD. Whenever possible I try to organize my shower so that I have it ~30min prior to my booking time.
I even have a special shower "ritual" that I go through to ensure I am squeaky clean. I have a heavy/coarse beard so I shave twice while in the shower to ensure my face is baby smooth so I don't leave razor rash all over my SP. I also do a thorough soap and rinse twice, and do my crotch and crack 3 times. I have a hairy crack, so I actually worry that even 3 times is not enough.
The whole time I am in the shower I am swishing a mouthful of Listerine, and while I am travelling to the incall I take also take several sips of water and swish it around in my mouth to ensure it is still fresh on arrival.
Most ladies who know me don't require me to shower on arrival, but if they do then I am happy to oblige.
If I'm coming over from work and not able to do my shower ritual prior to leaving then I'll do it at the SP's incall (including bringing a razor).