Last night I had sex with a friend. We started making out, I fingered him for a while and he ejaculated a little. He immediately wiped the semen with a towel, then I put a condom on his penis as it was still hard, used some saliva as lube and started having anal sex. I'm not sure if he wiped all the semen and I'm afraid some of it could have entered my body as he held his penis while penetrating me with the same hand he used for cleaning himself. Is it a high risk?