I'm not real picky - though I do prefer the thin ones - but I've yet to have a lady say no to using ones I've brought. I tend to see ladies who prefer BBBJs though so the taste doesn't become an issue

so that she will know that they are safe.

This is a touchy issue, and some will not want it discussed beforehand because it gets to close to a discussion of sex; but some gals will discuss it.

I asked a lady about that.  The reason she would only use hers is that she know they were safe and not tampered with in some way.

For most providers, the concern will be making sure teh condoms are in unopened package, and do not appear to have been carried around in a wallet for a while.

You may encounter some ladies like myself though, who are very sensitive to using different condoms. For that reason, I only use one particular brand that does not irritate me. So I always politely decline when a gentleman brings condoms of his own.

Including;

A) an ultra thin condom
B) a non-latex condom
C) a large condom

Some, including myself, also make Female Condoms available.  These are great for newbies who have difficulty maintaining an erection with any condom.

I used to include desensitizing condoms for gentlemen who cum too quickly, but found that the desensitizing gel is hard to remove (even with soap and water) and is not conducive to an oral finish.  It left my mouth and tongue numb and uncomfortable.

If a gent has a specific condom he wants me to use, he can expect me to take the package (box) into the bathroom to open it and inspect the contents before agreeing to their use.  He can also expect me to refuse to use any lambskin condoms, as occasionally I do meet a client who requests them.  Lambskin protects against pregnancy, but not disease.  I also refuse to use novelty condoms: glow in the dark, etc. as I prefer well-tested condoms to brands I do not know.

However, there are some providers who will not agree to the use of any condoms other than their own.