I had a body massage or frottage with a lady I know nothing about her health status. Throughout the process I was wearing an under pant, she rubbed/brushed her vagina against the upper part or base of my penis. My penis was not pointing upward but was laid flat with the penis hole or urethra facing flat between my thighs. At the end of frottage she put her fingers in her vagina and I think discharge some liquid on my underpant around the top (base) of my penis around the groin to where the penis whole is. My question is can I contract sti or hiv through this narrated encounter? Even though I ejaculated at the other end too, not where she discharge body fluid and my underpant was still on me. Thanks in advance.