semen on my chest

I'm a bi-sexual male who just recently had sex with a male about an hour ago and i'm don't know his status. we kissed, i used condoms for anal sex. he went down on me without a condom. and it was dark but i couldn't tell if the the head of his was pale and white and he didn't let me know before hand that he was ejaculating, and it ended up on my chest. i don't think it went down my belly-button. also he gave me a towel to wipe it off then later after i ejaculated i wiped it off with the same towel he gave me to wipe his semen off but i don't remember if he washed his semen off before he gave it back to me. i wiped myself off all over my chest and around my penis including the tip. i'm getting worried already, am i at risk if he had anything?

[LIZZIE LOU]

hiv is transmitted through...

unprotected vaginal/anal intercourse (PENETRATION)
sharing iv drug works
mother to child