Absolutely! As long as it wouldn't create any negative feelings for anybody else in attendance
It really depends on circumstances. For larger funerals, it is easy enough to attend without it being awkward. For smaller ones, it is probably a good idea to ensure that somebody knows you are coming.
I have sat with suitors in a hospice and held their hand while they transitioned. Not because they didn't have family and friends - but because they requested I be there for them.
I have had fathers and one mother call me to let me know that their child has passed away and request that I come to the funeral, wake, shiva or other gatherings.
They were all aware that I was an important part of their loved ones life, and the manner in which we met doesn't diminish the genuine love and authentic connection that we share.
I would never go to a funeral, regardless of how close I was to a gentleman, if it could cause heartache or negativity in any way for anyone else close to him. But that is also true of anybody I have met in any other capacity.
Many of my closest friends and relationships have been forged through this arena, and the fact that I choose to share my love and joy with others is not an issue for most people. Being a courtesan is merely an extension of who I am and another outlet for showing unconditional love and acceptance to others, while celebrating life together.