Can you catch hiv from rubbing? i'm a male and another male was rubbing his penis on my anus. without penetration. is it possible to catch hiv?

Little or no risk. No sexual transmission of HIV without penile penetration.

It has to do with the intensity of the activity and the existence or formation of skin microtears that creates the premises for possible transmission, otherwise rare.

Agree with Dr. H about the low risk of HIV, however, HIV is only one of the STDs. A condom may not protect against HPV, Herpes, LGV, syphilis, pubic lice etc. It would be prudent to see your doctor for an evaluation. Visit this site for information: https://www.cdc.gov/std/default.htm Wish you good health!