That's something I wouldn't ever feel comfortable presuming was OK, so I would always ask first.  Besides, I've been told it really stings to take a shot in the eye, so a gentleman would always want to give a lady the opportunity to protect herself.

and an experienced lady will be expecting it & will have decided how she wants to handle it...  CIM, swallow, spit, facial, tits, a hand intercept...   I have nerve damage & I think the gal can tell before I know...   If you know your cum goes all over, you really ought to warn her.  My case is not an issue

Will get you on to a lot of "Do Not See" lists.

....anything they haven't heard before, so look at it that way.  They HAVE heard it all.  "Fetish friendly" is always something nice to see in a ladie's advertisement, but as others have said you certainly always need to first communicate your actual intentions.  Never be embarrassed to talk about your needs and fantasies, again they have heard it all many times and listening to your needs without judgement is part of their job description.  This is what makes them different from, oh lets just say, the wife.....

AND  

   !

Very little (bareback intercourse is the obvious exception) is taboo in this hobby as long as you ask and get the ladie's permission first.  Asking for bareback will likely get you kicked out and blacklisted from what I have read.  You will be surprised by what some of THEM enjoy as well.  

The one and only bad date I have had in this hobby was when I pre-jismed a little into a lady's mouth and knew she wasn't CIM, it was entirely incidental and it was NOT a good scene in the room, she was understandably ballistic and I actually...cried on the way home, I was so upset that I had offended her.  She asked not to be reviewed, and wasn't....that shit can't be prevented and I guess can happen every 60 or 70 dates or so, just pray that it is with a lady who offer CIM when it does for goodness sake...

Absolutely ask... That shit is dangerous!

This whole conversation reminded me of an incident with a civilian (my actual GF at the time)

While in missionary, I pulled out to paint her stomach, which she always got a kick out of, and accidentally hit her dead in the eye!  Total shock and a once in a lifetime distance record...LOL

We laughed about it at first, but within a few minutes her eye started swelling up red and it took at least a day for it to stop hurting.  Tough to explain over dinner at her folks house later that evening.

Later the subject came up while we were having a drink with her girlfriend. My GF tells her it got her in the eye and her friend says "that's why you're supposed to swallow instead of pulling it out of your mouth."

To which my GF says "He was in me, but not in my mouth"  The look on her friend's face was priceless...LOL