Oral sex is low risk for all STDs, especially HIV, and the vaginal sex was protected. Don't worry about it.
My apology for posting it here. I guess like many others, I'm mostly worried about HIV and that's why I posted here. May I ask if you think based on what I did with the CSWs I am at risk for HIV or any STDs? Thank you very much for your help and response.
Since the question concerns STDs and STD symptoms, thie question really should have been in the STD forum, not here. But in any case, the answer is brief: no STD can cause what looks like an abrasion or bruise that comes on with masturbation; and certainly the use of a towel or t-shirt could cause an abrasion. Of course if you remain concerned, see a health care provider about it.
Best wishes-- HHH, MD