Some questions can be pretty accurately answered based on the first few words -- in this case, the title you chose for your question. Oral sex is low risk for all STIs, and condom-protected oral sex is no risk at all. In addition, I have also read your discussion with Dr. Hook a year ago, with questions about a similar exposure:  it seems to have inluded all the kinds of contact you describe here except the oral sex event, i.e. questions 2 and 3 this time. The answers are the same -- and should be very reassuring. The bottom line is that you are at no risk for any STI, should not be tested, and can safely continue unprotected sex with your partner. But to assure no misunderstanding:

1) Condom protected oral sex is zero risk for any and STIs.

2) Kissing skin anywhere on the body carries little or no risk for any STI. The scrotum is at no greater risk for acquiring infection than anywhere else -- no different than cheek, chest, elbow, or anywhere else you can think of. Saliva rarely transmits any infection -- in fact, saliva kills many bacteria and viruses, including HIV.

3) Fingering and hand-genital contact is no risk for any infection.

So all is well -- you should be having no worries at all. I recommend against testing and that you continue your normal sexual practices at home.

I hope these comments are helpful. Let me know if anything isn't clear.

HHH, MD