I don't want to do CIM, ever.
Once a client came on my breasts and there was blood in his cum 😳
He apologised and mentioned something like: that's what happens when a man is old. But he wasn't that old, about 60. Anyway, since then I started to be afraid of CIM even more. The problem is, if you put in your profile no CIM, every second client starts to beg for it. So I started putting CIM but for a lot of money. Nobody asks anymore 🙂
The risk of catching something through cum is much higher girls. If you do it, at least charge additionally, and never include it. It's as wrong as sending your face pictures to those who ask.