From context I thought that DATY meant cunnilingus, but had no idea where that came from. Apparently it's Dining At The Y.
Hep C is an STD, it's not in it's own category.
It's transmitted through blood, so kissing and receiving oral aren't considered risks. If you want to be safer still, don't brush your teeth or shave immediately before seeing a client, and don't kiss if you have wisdom teeth coming through or something. Definitely don't borrow a client's toothbrush or razor.
Herpes is a risk, but I cycled to work and back today and now I'm tired, so my brain isn't up to dealing with that at the moment. Maybe later.