Dear Doctor,
one month ago I had casual sex with a guy who claimed to be "clean". He rubbed his penis against my anus, which was covered with lube, and there might have been some pre-cum as well. Anal frottage lasted for about 20 seconds, and he never penetrated me (he was pressing, but never slipped in). Is it risky for HIV? I can't be sure about pre-cum, since the area was already wet with lube, but if pre-cum was involved would it be risky?
Thank you in advance and best regards,
Alex