You cannot completely mitigate STI risk, just manage it. Do what you can to make sure your immune system is in good shape. If you get frequent illnesses, infections, etc., stay away from the hobby. If you have anxiety about STIs, just stick with HJs, CBJs and CFS. Make sure the SW is clean, no odors and seems healthy. Take a shower before and after each session. I get kissing, DATY and BBBJs all the time, and once in a while BBFS, and so far so good. Apart from a UTI when I was 19 I have not had any STIs. Though I am overweight I am generally quite healthy, eat well and take a cup full of supplements every day.
As for SWs enjoying DATY, most do not until you have been with them a few times so they get comfortable with you, maybe even like you, and you find out what they like (every woman is different). I love that two of my regulars initiate 69 or just sit on my face unprompted or tell me to do certain things. On a different subject, while some SWs like sex, orgasm can leave them quite tired so they resist cumming more than a couple of times a week. Remember, while we are being spoiled they are working. I have had more than a few pull away from me when I "hit the spot". I like 69 much more than BJs, because I am both a giver and a receiver. Although a woman giving me a BBBJ on her knees is a powerful turn on (same thing with dirty talk).