Thanks doctor for troubling you.
You can not penitrate her anal cavity with underwear covering your penis.
Hi, my actual action was cover her virgina with a towel cloth and me wearing underwear on top of her performing anal sex and she told me she was wet. But I can tell I did not take up my underwear no doubt i did not wear condom during the action. But I felt like it was inside her. So consider this as an protected sex?
If your penis went into her anus and you did not have a condom then yes it is unprotected. covering her vagina with a towel and you wearing underwear has nothing to do with your penis inside of her.
Hi doctor, wearing underwear and cover her virginal with a white towel during anal sex, do you consider this as an unprotected anal sex?
So in your question you were worried about STD's and HIV passing through clothes and not unprotected anal sex?
If you had unprotected anal sex with this person then you need to test.
Gonorrhea and chlamydia-1 week
syphilis-6 weeks
HIV and Herpes-3 months
Did you use a condom for anal sex?
Anything else you did is not a risk, STD's do not transmit through clothes.