Hi, is there any threat of infection from semen exposed to air. 4 years ago, in a drunken fit, i was encouraged by my guy friends to touch another guys penis. I met this unknown person and he had masturbated in his handkerchief which was placed on a dusty table. He gave me a hand job and proceeded to wipe me off with the handkerchief that was drenched with his cum. I fought it away, but guess got a dab on my foreskin from that handkerchief. I did go for counselling and was told it was safe.
Wanted to know
1) if it was absolutely safe
2) if HIV can transmit this way at all?