I can't comment on anything other than STDs. No STDs are spread by contaminated water, towels/bed sheets, or oils.
The ONLY ways you'll get an STD are:
1 - Mouth to genital contact - think oral sex
2 - Genital to genital contact, unclothed - rubbing, grinding, penetration
3 - Genital to anal contact, unclothed - rubbing, grinding, penetration
STD stands for sexually transmitted disease. You have to have some kind of sexual activity in order to transmit them.
You have been told you had no risk. We wish you the best.
*** thread closed ***