I have always used condoms with escorts and think most always use them with clients.  To date I have never smelt condom on a lady when giving her oral!

However some escorts will have boyfriends, do they use condoms with them or might they let him cum inside them – the though of another mans sp**k in a lady is strange.

Any one any experience/knowledge?

That's gross, but very likely situation when visiting an escort. That's why im giving oral only to my girlfriends.